Between enquiries like this and the TUI thread in latter days (with the focus on why one 737 hasn’t flown for a few days), this board is showing an increasingly firm grasp on the non-essentials. Someone has had an incap or near incap event today which may well result in the individual concerned being unable to fly for a period of time. And here we are querying why one aircraft flew and another didn’t. It’s unreal. Can we banish this to Spectators Balcony?
PS - I hope the individual concerned is ok.
PPS - well done to Jet2 on speedy recovery of a situation in which no airline would ever wish to find itself.