Tui is withdrawing an aircraft due to be based at Leeds Bradford airport next summer and cancelled a series of flights.
Local reports suggest six routes will not return from the Yorkshire airport in summer 2019.
These are believed to be to Antalya, Burgas, Dubrovnik, Ibiza, Paphos and Rhodes.
However, the destinations will continue to be served by a mix of Jet2 and Ryanair.
Tui is to maintain flights to serve cruises from Corfu and Majorca next summer.
A Tui UK spokesperson said: “We’ve been able to re-look at our summer 2019 programme and we’ve made a few changes to our flight schedule.
“We’ll be moving an aircraft which was due to be based at Leeds to another airport within our regional network as we continue to support growth at some of our key focus airports for the year ahead.
“This has resulted in a number of flights being cancelled from Leeds Bradford airport.
“We are directly contacting any affected customers with alternative travel options and offering a gesture of goodwill.”
No further details were available from the operator.