Drop tank
Videos
In aviation, a drop tank is used to describe auxiliary fuel tanks externally carried by aircraft. A drop tank is expendable and often capable of being jettisoned. External tanks are commonplace on modern military aircraft and occasionally found in civilian ones, although the latter are less likely to be discarded except in an emergency.
A 600 US gallons (2,300 L) Sargent Fletcher drop tank being moved across the flight deck of an aircraft carrier
Drop tank storage aboard USS Harry S. Truman (CVN-75)
Bulgarian Heinkel He-51B, with drop tank under fuselage
A standard 300 liter capacity drop tank of the German WWII Luftwaffe
Conformal fuel tank
Videos
Conformal fuel tanks (CFTs) are additional fuel tanks fitted closely to the profile of an aircraft that extend the endurance of the aircraft.
A McDonnell Douglas F-15E Strike Eagle fitted with conformal fuel tanks under the wing roots
Ground crew handling the CFT of an F-15E
Israeli F-16I Sufa, based on the F-16D Block 50/52+, with 2 attached CFTs on top of the aircraft near the wing root and 2 wing-mounted drop tanks.