That can be quite dangerous for the crew members involved. If Ryanair pay up now and then at some stage in the future Ryanair win an appeal the crew will face a very large bill. The money won this time around may be useless to them until all court dealings and appeals are completed.

Your "legal loophole" is just common practice. What you fail to recognize that this is a preliminary judgement. It is no more or less than an initial, short review of the case meant to prevent immediate irrevocable damages to one party. It's nothing more than a single judge, basically saying "RyanAir failed to demonstrate the business need for base closure at this time". The judge wrote:

Which translates to: "Ryanair failed to provide evidence to establish that the decision to close the base was made for financial reasons".

And this is the one item that makes or breaks the case. Earlier in the judgment, the judge acknowledged the freedom of the company to organize its business however it wants, as long as it is for financial reasons. The employees are stating that this is for retaliatory reasons, the company says it is not. If the company can establish that it was for financial reasons, that's part of doing business and the company is entitled to layoff all its local employees.

In other words: all that Ryanair has to do is to provide, during the "bodemprocedure", sufficient financial reasons for the closure of the base, and the case is gone. In fact, if they lose, the employees may be liable to refund Ryanair for all or part of the judgement collected with your "uitvoerbaar bij voorraad". Remember that a "kort geding" is a preliminary judgement of the case.

Being quite familiar with the Dutch legal system, my assessment is that Ryanair messed up bigtime by having amateurs handle this case. I'm sure that once they hire experienced local attorneys, they will get this case overturned in their favor. Again, all they have to establish is that the base is closed for financial reasons.

Which doesn't mean I think they aren't donkey butts. But mark my words, this is going to be the legal reality. I will link back to this post in 2-3 years from now.

If Pilots are clever they will seek a quick negotiated settlement, if not then they could remain as Ryanair employees for a couple of years, great salary but no right to fly with anybody else.

Ruling is one thing but final judgement is another after appeals. If any pilot becomes employed assumming court rules in their favour then Ryanair can claim they lost nothing.

Old rule is negotiate before going to court if you can negotiate it avoids the lawyers costs and a desire to leave it in court for years and I would fully expect appeals to go down that route.