| Airline | Country | Image | Joined | Description | Fate |
| Thomas Cook Airlines UK | United Kingdom | | 2003–2019 | Thomas Cook Airlines was established in 2003 after being renamed from the former JMC Air. As of 2016, the airline operated an 'all Airbus fleet' operating the Airbus A321 and Airbus A330. | Compulsory liquidation; closed down on 23 September 2019. |
| Condor | Germany | | 2001–present | Condor Flugdienst is a German carrier established in 1956 and previously a fully owned subsidiary of Lufthansa. It operates a mixed fleet of Boeing and Airbus aircraft. | Continues to operate; planned acquisition by LOT Polish Airlines withdrawn on 13 April 2020; now owned by British investment firm Attestor Capital. |
| Thomas Cook Aviation | Germany | | 2017–2020 | In January 2017 Air Berlin Aviation GmbH received the approval for the Air Operator's Certificate (AOC) after being acquired by Thomas Cook Group. The airline operated six Airbus A320 aircraft out of Düsseldorf and Leipzig. The company was renamed to Thomas Cook Aviation in November 2018. | Aircraft transferred to Condor in December 2019; filed for bankruptcy on 2 April 2020. |
| Thomas Cook Airlines Balearics | Spain | | 2017–2019 | Thomas Cook Airlines Balearics was established in 2017 after the acquisition of Thomas Cook Airlines Belgium by Lufthansa. The airline operated 6 Airbus A320-200 aircraft and operated in the United Kingdom and Germany. | All aircraft transferred to Condor; it was declared insolvent on 26 December 2019, though it still operated some flights on behalf of Condor until it finally ceased all operations in January 2021. |
| Thomas Cook Airlines Scandinavia | NorwayDenmarkSwedenFinland | | 2007–2019 | Thomas Cook Airlines Scandinavia was a Scandinavian airline that operated flights from Denmark, Norway, Sweden and Finland to worldwide destinations. The airline operated the Airbus A321-200, Airbus A330-200 and Airbus A330-300. | Acquired by an investment consortium and rebranded as Sunclass Airlines on 30 October 2019. |
| Thomas Cook Airlines Belgium | Belgium | | 2002–2017 | Thomas Cook Airlines Belgium was a Belgian leisure airline owned by the Thomas Cook Group. It operated scheduled flights to destinations throughout Europe and Africa from its base at Brussels Airport. | Ceased operations when it was sold to Lufthansa AG in 2017. |
| Thomas Cook Airlines Canada | Canada | | 2010–2013 | Thomas Cook Airlines Canada was a Canadian charter division of the Thomas Cook Group based in Montreal, Quebec, Canada. It served destinations to the Caribbean, Mexico and to North America. | Ceased operations when Thomas Cook Group sold Sunquest Vacations to Red Label Vacations in March 2013. |
