Thomas Cook Group Airlines Limited was an airline holding company of the defunct British Thomas Cook Group. The airlines operated as a single operating segment of the Thomas Cook Group to allow aircraft to be used when and where they were needed. There were five members of the airline division at the time of the airline's closing, consisting of Condor, Thomas Cook Airlines, Thomas Cook Airlines Balearics, Thomas Cook Airlines Scandinavia, and Thomas Cook Aviation. The airline operated with a total of 105 aircraft based in the United Kingdom, Denmark and Germany.

Thomas Cook Group plc was a global travel group, headquartered in the United Kingdom and listed on the London Stock Exchange from its formation on 19 June 2007 by the merger of Thomas Cook AG — successor to Thomas Cook & Son — and MyTravel Group until 23 September 2019, when it went into compulsory liquidation. The group operated as a tour operator and airline, and also operated travel agencies in Europe. At the time of the group's collapse, approximately 21,000 worldwide employees were left without jobs and 600,000 customers were left abroad, triggering the UK's largest peacetime repatriation.