Winter 2014/15
I would assume that the return of Thomson for Winter 2014/15 would depend on their analysis of passenger data for their other northern airports during 2013/14. How many previous customers booked out of their other airports? How many customers came from the Teesside catchment area. How many did they lose by not using Teesside. It's all a question of balance. If they lost enough to make reinstating the flights viable then they might do so. If the bulk of their regular customers were happy to fly from another airport - and have a much wider choice of destinations - then bye-bye Thomson for the winter!