The obvious significant players for those two airports don't look a good bet - at the moment.
Either posting you wherever they want in their low cost empires or in the case of the charter companies requiring a lot of filling in at other busier bases especially during the winter. Lots of mini bus and hotac time to log.
The smaller companies have to stay 'flexible' to survive because it's contract work. You go where the work is.
For stability in that geographical area I'd take a sideways look and suggest looking at the exec operations. That said 18months is a very long time in this business.
Regards
Rob