Originally Posted by
GAXLN
Sorry, couldn't resist - Just a guess but could it be aircraft? Most airlines will need to charter in from time to time as it would never be sensible to always have enough spare aircraft should anything go wrong. The important thing is to avoid any EU261 payouts if this can be avoided.
But the cost of keeping those aircraft airworthy might deride that idea...better to pay out rather than have a few 'back-ups'.