Ive been having a hard time getting that answer as well.

Someday I wouldnt mind flying for Cair but being married with a kid on the way and basically a nonmoveable object it would have to be BOS year round.

What I have heard is that "only if your seniority can hold it". I think that is the answer right there, if the summer ends and they want to send you elsewhere and you say no then you are out a job.

Sounds logical, but I can dream.