trancada, yes.
Any Spanish mainland base can result in a Winter (or two ) in the Canarias, lovely place, but, a bit of a commute depending on where home is.
They tried to forcefully rebase people from Spain to FCO (on inferior conditions ) but SEPLA (the Spanish Union ) intervened successfully.
Couple of years ago some guys were "removed" from LGW & sent packing to MAD to be replaced by more junior Capts who happened to be line trainers.
In a word, base stability is not a foregone conclusion, even during company conversion course people have had the "offer" changed with a clear choice, "accept or goodbye".