Re-Heat, I suggest that you get your facts right before posting.
It's 800 out of 40,000 who have volunteered to work for free. 4000 have taken unpaid LEAVE and 1,400 are to work part-time. The latter 2 are to benefit the workers themselves, especially amongst cabin crew many want part-time and many are happy to take unpaid leave. Working for free is different matter entirely.