Flying slower
Done selectively this is not a bad plan, even for airlines that have money left. The same applies to driving. If you are late then some may race down the M1 at 85 mph. If however you do not need to be at luton so soon then keeping it down to 70 will save a fourtune. It is very non-linear with a large saving on fuel for only a small reduction in speed.
The more an airline spends on Fuel the less is remains to spend on staff.