1.
Airline codes
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This is a list of airline codes. The table lists IATAs two-character airline designators, ICAOs three-character airline designators, IATA airline designators, sometimes called IATA reservation codes, are two-character codes assigned by the International Air Transport Association to the worlds airlines. The standard is described in IATAs Standard Schedules Information Manual and the codes themselves are described in IATAs Airline Coding Directory, Airline designator codes follow the format xx, i. e. two alphanumeric characters followed by an optional letter. Although the IATA standard provides for three-character airline designators, IATA has not used the third character in any assigned code. This is because some legacy computer systems, especially the central reservations systems, have failed to comply with the standard, the codes issued to date comply with IATA Resolution 762, which provides for only two characters. These codes thus comply with the current airline designator standard, there are three types of designator, unique, numeric/alpha and controlled duplicate. IATA airline designators are used to identify an airline for commercial purposes in reservations, timetables, tickets, tariffs, air waybills, a flight designator is the concatenation of the airline designator, xx, and the numeric flight number, n, plus an optional one-letter operational suffix. Therefore, the format of a flight designator is xxn. After an airline is delisted, IATA can make the code available for reuse after six months, controlled duplicates are issued to regional airlines whose destinations are not likely to overlap, so that the same code is shared by two airlines. The controlled duplicate is denoted here, and in IATA literature, an example of this is the code 6Y, which refers to both Mid Airlines, a charter airline in Sudan, and Med Airways, a charter airline in Lebanon. IATA also issues an accounting or prefix code and this number is used on tickets as the first three characters of the ticket number. The IATA codes originally based on the ICAO designators which were issued in 1947 as two-letter airline identification codes and these codes are unique by airline, unlike the IATA airline designator codes. The designators are listed in ICAO Document 8585, Designators for Aircraft Operating Agencies, ICAO codes have been issued since 1947. The ICAO codes originally based on a two-letter-system and were identical to the codes used by IATA. After an airline joined IATA its existing ICAO-two-letter-code was taken over as IATA code, so in the 1970s the abbreviation BA was the ICAO code and the IATA code of British Airways while non-IATA-airlines like Court Line used their 2-letter-abbreviation as ICAO code only. In the early 1980s ICAO introduced the current three-letter-system due to the number of airlines. It became the new standard system in November 1987. Other designators, particularly starting with Y and Z, are reserved for government organizations
2.
Airline hub
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Airline hubs or hub airports are used by one or more airliners to concentrate passenger traffic and flight operations at a given airport. They serve as points to get passengers to their final destination. It is part of the hub-and-spoke system, an airline operates flights from several non-hub cities to the hub airport, and passengers traveling between spoke cities need to connect through the hub. This paradigm creates economies of scale that allow an airline to serve city-pairs that could not be economically served on a non-stop basis. This system contrasts with the point-to-point model, in there are no hubs. Hub airports also serve origin and destination traffic, the hub-and-spoke system allows an airline to serve fewer routes, so fewer aircraft are needed. The system also increases passenger loads, a flight from a hub to a spoke carries not just passengers originating at the hub, additional employees and facilities are needed to cater to connecting passengers. To serve spoke cities of varying populations and demand, an airline requires several aircraft types, in addition, airlines may experience capacity constraints as they expand at their hub airports. For the passenger, the system offers one-stop air service to a wide array of destinations. However, having to make connections en route to their final destination increases travel time. Additionally, airlines can come to monopolise their hubs, allowing them to increase fares. Airlines may operate banks of flights at their hubs, in several flights arrive. The banks may be known as peaks of activity at the hubs, banking allows for short connection times for passengers. In addition, banking could result in inefficient aircraft utilisation, with aircraft waiting at spoke cities for the next bank, instead, some airlines have debanked their hubs, introducing a rolling hub in which flight arrivals and departures are spread throughout the day. This phenomenon is known as depeaking. While costs may decrease, connection times are longer at a rolling hub, American Airlines was the first to depeak its hubs, trying to improve profitability following the September 11 attacks. It rebanked its hubs in 2015, however, feeling the gain in connecting passengers would outweigh the rise in costs, the hub-and-spoke system is also used by some cargo airlines. FedEx Express established its main hub in Memphis in 1973, prior to the deregulation of the air industry in the United States
3.
Yellowknife Airport
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Yellowknife Airport is located in Yellowknife, Northwest Territories, Canada. The airport is part of the National Airports System, and is operated by the Government of the Northwest Territories, the airport has regular scheduled passenger service and a number of freight services. In 2007, the terminal handled 527,000 passengers, in 2008 the airports passenger terminal underwent an expansion to the departure/check in section, roughly doubling the size of the terminal. The airport is classified as an airport of entry by Nav Canada and is staffed by the Canada Border Services Agency, CBSA officers at this airport can handle general aviation aircraft only, with no more than 15 passengers. The Royal Canadian Mounted Police G Division maintains a hangar for its air section just south of the passenger terminal. It is adjacent to a used by the Royal Canadian Air Force to house the CC-138 Twin Otter and other utility aircraft operated by 440 Squadron. Canadian NORAD Region Forward Operating Location Yellowknife is located south-west of the airstrip and it was built for forward deployment of the CF-18 Hornet in times of conflict. It also has a CC-138 permanently based at the airport for search, the airport has its own fire and rescue service. The department has 10 firefighters, but requires two or three fire fighters on shift to operate a single crash tender. Ambulance and additional fire response is provided by the Yellowknife Fire Department
4.
Yellowknife
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Yellowknife is the capital and only city, as well as the largest community in the Northwest Territories, Canada. It is located on the shore of Great Slave Lake, approximately 400 km south of the Arctic Circle. The current population is ethnically mixed, of the eleven official languages of the Northwest Territories, five are spoken in significant numbers in Yellowknife, Dene Suline, Dogrib, South and North Slavey, English, and French. In the Dogrib language, the city is known as Sǫ̀mbakè, the Yellowknife settlement is considered to have been founded in 1934, after gold was found in the area, although commercial activity in the present-day waterfront area did not begin until 1936. Yellowknife quickly became the centre of activity in the NWT. As gold production began to wane, Yellowknife shifted from being a town to a centre of government services in the 1980s. However, with the discovery of diamonds north of Yellowknife in 1991, traditionally, First Nations people of Yellowknives Dene culture had occupied this region, by the 1930s they had a settlement on a point of land on the east side of Yellowknife Bay, Dettah. The current municipal area of Yellowknife was occupied by prospectors who ventured into the region in the mid-1930s, blakeney, made the first discovery of gold in the Yellowknife Bay area in 1898. The discovery was viewed as unimportant in those days because of the Klondike Gold Rush, in the late 1920s, aircraft were first used to explore Canadas Arctic regions. Samples of uranium and silver were uncovered at Great Bear Lake in the early 1930s, in 1933 two prospectors, Herb Dixon and Johnny Baker, canoed down the Yellowknife River from Great Bear Lake to survey for possible mineral deposits. They found gold samples at Quyta Lake, about 30 km up the Yellowknife River, the following year, Johnny Baker returned as part of a larger crew to develop the previous gold finds and search for more. Gold was found on the east side of Yellowknife Bay in 1934, when government geologists uncovered gold in more favourable geology on the west side of Yellowknife Bay in the fall of 1935, a small staking rush occurred. From 1935 to 1937, one prospector and trapper named Winslow C, Ranney staked in the area between David Lake and Rater Lake with few commercial results. The nearby hill known as Ranney Hill is his namesake and a hiking destination today. Although Con Mine was the most impressive gold deposit and its development created the excitement that led to the first settlement of Yellowknife in 1936–1937, Some of the first businesses were Corona Inn, Weaver & Devore Trading, Yellowknife Supplies and post office, and the Wildcat Cafe. Con Mine entered production on September 5,1938, the population of Yellowknife quickly grew to 1,000 by 1940, and by 1942, five gold mines were in production in the Yellowknife region. However, by 1944, gold production had ground to a halt as men were needed for the war effort, an exploration program at the Giant Mine property on the north end of town had suggested a sizable gold deposit in 1944. This new find resulted in a massive post-war staking rush to Yellowknife and it also resulted in new discoveries at the Con Mine, greatly extending the life of the mine
5.
Northwest Territories
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The Northwest Territories is a territory of Canada. At a land area of approximately 1,144,000 km2 and its estimated population as of 2016 is 44,291. Yellowknife became the capital in 1967, following recommendations by the Carrothers Commission. The Northwest Territories are bordered by Canadas two other territories, Nunavut to the east and Yukon to the west, and by the provinces of British Columbia, Alberta, and Saskatchewan to the south. The name is descriptive, adopted by the British government during the era to indicate where it lay in relation to Ruperts Land. It is shortened from North-Western Territory, in Inuktitut, the Northwest Territories are referred to as ᓄᓇᑦᓯᐊᖅ, beautiful land. There was some discussion of changing the name of the Northwest Territories after the splitting off of Nunavut, one proposal was Denendeh, as advocated by the former premier Stephen Kakfwi, among others. One of the most popular proposals for a new name – one to name the territory Bob – began as a prank, in the end a poll conducted prior to division showed that strong support remained to keep the name Northwest Territories. This name arguably became more appropriate following division than it had been when the territories extended far into Canadas north-central and it possibly meets Manitoba at a quadripoint to the extreme southeast, though surveys have not been completed. It has an area of 1,183,085 km2. Territorial islands in the Canadian Arctic Archipelago include Banks Island, Borden Island, Prince Patrick Island and its highest point is Mount Nirvana near the border with Yukon at an elevation of 2,773 m. The Northwest Territories extends for more than 1,300,000 km2 and has a large climate variant from south to north, the southern part of the territory has a subarctic climate, while the islands and northern coast have a polar climate. Summers in the north are short and cool, with highs in the mid teens Celsius. Winters are long and harsh, daytime highs in the mid −20 °C, extremes are common with summer highs in the south reaching 36 °C and lows reaching into the negatives. In winter in the south, it is not uncommon for the temperatures to reach −40 °C, in the north, temperatures can reach highs of 30 °C, and lows can reach into the low negatives. In winter in the north it is not uncommon for the temperatures to reach −50 °C, thunderstorms are not rare in the south. In the north they are rare, but do occur. Tornadoes are extremely rare but have happened with the most notable one happening just outside Yellowknife that destroyed a communications tower, the Territory has a fairly dry climate due to the mountains in the west
6.
Canada
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Canada is a country in the northern half of North America. Canadas border with the United States is the worlds longest binational land border, the majority of the country has a cold or severely cold winter climate, but southerly areas are warm in summer. Canada is sparsely populated, the majority of its territory being dominated by forest and tundra. It is highly urbanized with 82 per cent of the 35.15 million people concentrated in large and medium-sized cities, One third of the population lives in the three largest cities, Toronto, Montreal and Vancouver. Its capital is Ottawa, and other urban areas include Calgary, Edmonton, Quebec City, Winnipeg. Various aboriginal peoples had inhabited what is now Canada for thousands of years prior to European colonization. Pursuant to the British North America Act, on July 1,1867, the colonies of Canada, New Brunswick and this began an accretion of provinces and territories to the mostly self-governing Dominion to the present ten provinces and three territories forming modern Canada. With the Constitution Act 1982, Canada took over authority, removing the last remaining ties of legal dependence on the Parliament of the United Kingdom. Canada is a parliamentary democracy and a constitutional monarchy, with Queen Elizabeth II being the head of state. The country is officially bilingual at the federal level and it is one of the worlds most ethnically diverse and multicultural nations, the product of large-scale immigration from many other countries. Its advanced economy is the eleventh largest in the world, relying chiefly upon its abundant natural resources, Canadas long and complex relationship with the United States has had a significant impact on its economy and culture. Canada is a country and has the tenth highest nominal per capita income globally as well as the ninth highest ranking in the Human Development Index. It ranks among the highest in international measurements of government transparency, civil liberties, quality of life, economic freedom, Canada is an influential nation in the world, primarily due to its inclusive values, years of prosperity and stability, stable economy, and efficient military. While a variety of theories have been postulated for the origins of Canada. In 1535, indigenous inhabitants of the present-day Quebec City region used the word to direct French explorer Jacques Cartier to the village of Stadacona, from the 16th to the early 18th century Canada referred to the part of New France that lay along the St. Lawrence River. In 1791, the area became two British colonies called Upper Canada and Lower Canada collectively named The Canadas, until their union as the British Province of Canada in 1841. Upon Confederation in 1867, Canada was adopted as the name for the new country at the London Conference. The transition away from the use of Dominion was formally reflected in 1982 with the passage of the Canada Act, later that year, the name of national holiday was changed from Dominion Day to Canada Day
7.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
8.
Charter airline
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Air charter is the business of renting an entire aircraft as opposed to individual aircraft seats. Some air charters brokers have been given authority to sell seats on private jets with mixed success. Some air charter companies offer a variety of aircraft, such as helicopters. Charter jet categories include turbo props, light jets, mid-size jets, super mid-size jets, heavy jets, long-range jets, there are an estimated 15,000 business jets available for charter in the worldwide fleet. The US market is the largest and the European market is the second largest, with growing activity in the Middle East, Asia, the changing landscape of air taxi and air charter. Media related to Charter airlines at Wikimedia Commons
9.
Arctic
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The Arctic is a polar region located at the northernmost part of Earth. The Arctic consists of the Arctic Ocean, adjacent seas, and parts of Alaska, Canada, Finland, Greenland, Iceland, Norway, Russia, land within the Arctic region has seasonally varying snow and ice cover, with predominantly treeless permafrost-containing tundra. Arctic seas contain seasonal sea ice in many places, the Arctic region is a unique area among Earths ecosystems. For example, the cultures in the region and the Arctic indigenous peoples have adapted to its cold, in recent years, Arctic sea ice decline has been caused by global warming. Life in the Arctic includes organisms living in the ice, zooplankton and phytoplankton, fish and marine mammals, birds, land animals, plants, Arctic land is bordered by the subarctic. The word Arctic comes from the Greek word ἀρκτικός, near the Bear, northern, there are a number of definitions of what area is contained within the Arctic. The area can be defined as north of the Arctic Circle, the southern limit of the midnight sun. The Arctics climate is characterized by cold winters and cool summers and its precipitation mostly comes in the form of snow and is low, with most of the area receiving less than 50 cm. High winds often stir up snow, creating the illusion of continuous snowfall, average winter temperatures can be as low as −40 °C, and the coldest recorded temperature is approximately −68 °C. Coastal Arctic climates are moderated by oceanic influences, having generally warmer temperatures, the Arctic is affected by current global warming, leading to Arctic sea ice shrinkage, diminished ice in the Greenland ice sheet, and Arctic methane release as the permafrost thaws. Due to the migration of the planets isotherms, the Arctic region is currently shrinking. Perhaps the most spectacular result of Arctic shrinkage is sea ice loss, there is a large variance in predictions of Arctic sea ice loss, with models showing near-complete to complete loss in September from 2040 to some time well beyond 2100. About half of the models show near-complete to complete sea ice loss in September by the year 2100. Arctic life is characterized by adaptation to short growing seasons with long periods of sunlight, Arctic vegetation is composed of plants such as dwarf shrubs, graminoids, herbs, lichens and mosses, which all grow relatively close to the ground, forming tundra. As one moves northward, the amount of available for plant growth decreases considerably. Colder summer temperatures cause the size, abundance, productivity and variety of plants to decrease, trees cannot grow in the Arctic, but in its warmest parts, shrubs are common and can reach 2 m in height, sedges, mosses and lichens can form thick layers. In the coldest parts of the Arctic, much of the ground is bare, non-vascular plants such as lichens and mosses predominate, along with a few scattered grasses, herbivores on the tundra include the Arctic hare, lemming, muskox, and caribou. They are preyed on by the owl, Arctic fox, Grizzly bear
