This all has the potential to get very expensive for TUI. They are claiming force majeure on the flight cancellations. If it was an official strike that would be so. With a work to rule it is less clear. Fifteen thousand passengers a day times 250 euros is a lot of money, not likely of course to be all claimed, but still a big issue. There are all the subcontracted aircraft, apparently over 20 yesterday. So the loss to TUI could be enormous, never mind the damage to the brand. If the deal falls apart and Air Berlin cancel the wet lease that is also a lot of money. If I was a director of TUI I would be very concerned.