Jet2holidays overtakes Thomas Cook to be the second largest: TUI UK remains number one among operators. The rank 
is based on seats that the Civil Aviation Authority (CAA) authorizes ATOL licensed operators. Operators are re-authorized every six months; the October semi-annual update came out last week. The previous re-authorization took place last April.
Jet2 is now licensed by the CAA to sell 2,936,420 ATOL-protected seats. Thomas Cook Tour Operations is licensed for 2,459,518 when factoring. TUI UK is licensed for 5.4 million passengers. It added 250,000 following the shutdown of Monarch on Oct. 2.
