I wonder if the share price might be a factor for some people - many were staying to reap the rewards from the BAYE and SAYE schemes, perhaps they're cutting their losses on the former, realising they won't profit from the latter, and then realising there's nothing left to stay for?
Things did look reasonably rosy last year, and I'm assuming that's why the results were so good. (In fairness, my survey was glowing). Now though? Who knows?
Things are much less stable at the moment, and from a cabin crew point-of-view not many seem entirely happy. Add to that the fact that a growing part of the crew community are on temporary contracts.
I'd be surprised if this year's Pulse shows a higher rate than 2006.