As stated above, the overtime at TUI is very lucrative and win win for the company and pilot.
As a year 5 FO I’ve grossed just over £100k per year over the last three years.
Yes I sign up for alot of overtime but my yearly flying hours are still no more than about 800 ish.
With no overtime I’m guessing it would be around the 620 ish hours mark and just over 80k gross.
Captains doing lots of overtime are grossing up to £200k.