The idea that the industry, Jet2 included, won't contract between by 10-20% as so many holidaying people have lost jobs is difficult to argue against now, since the 23rd March a lot has changed.
I've been pretty consistent in my assertion that the industry will contract by a hell of a lot more than 10-20%. That doesn't change my belief that TUI UK and Jet2 (the corporate entities) will come out of this in reasonable fighting shape. For a large number of pilots and cabin crew currently at both companies that'll be scant comfort because they will be out of work with little prospect of getting flying again.