SN passed all of its slots to its subsidiary DAT by selling them to this latter company. This way SN got some cash which could be used to keep the airline flying for about 1 more second I guess, but technnically speaking everythins was ok, because a company under chapter 11 is stimulated to sell assets.
The transaction was done with the explicit agreement of the 2 court commissioners at SN.
Good luck to those trying to block the transaction I'd say.
BTW, DAT has another point in case they might run into problems after all. As a newcomer to the Brussels airport, they have priority to any other airline currently operating in Brussels to take open slots on new destinations. Apart from Ryanair all airlines now stepping to the court have thus a lower proirity. Also, ryanair's request will in a Belgian court certainly be turned down, because they are not an involved party, as they do not want to fly out of Brussels.
these ruels are made to protect new companies like ryanair from established big carriers like Sabena, but now that we talk about DAT iso SN the tide has turned. ryanair now is the old strong airline and DAT is the new, small startup which must be protected.