What have you heard re jet2 and easyjet being in trouble?
"in trouble" is probably too strong a term but all airlines are struggling to generate revenue at the moment, some more than others...and the problem is across the board, it's not just the large carriers, not just the Flag Carriers, not just the LoCos...and it's regardless of whether their aircraft are painted red, white, blue, yellow, orange or a combination of colours.
The cuts you're seeing coming to fruition now, for example Jet2, BA, Virgin and many have or /are laying off personnel, and/or changing employee T&Cs, are the results of plans made on the basis of predictions made in March/April about the Virus's behaviour...and there's the problem.
If you cast your minds back the hope then was was that by late Summer the Virus would have blown itself out ( summer heat, Vitamin D, mutation etc). That's doesn't really appear to have happened...this is a long term problem.
End result is many airlines are now looking at Covid survival plan 2.0...it's looking even more ugly for employees...
Fundamentally all airlines are struggling, some won't survive.