Well all things being equal:
You live in the SE, you're younger than 35 and you don't have a jet command.
If you don't live in the South consider the commute, if you're over 35 and have a jet command, say with easyJet, then it'll take you 15 years to get back to the same salary. Add on a few years to recoup the losses over those 15 years and the effects of compound interest on your pension pot.....add in that it's better to have higher earnings whilst younger to let compound interest take effect....
Since I don't match the above criteria above BA is far from the best job in the UK.