I would guess 2-3 years till you start to see growth again. Limited hiring for 2 years with more to come in the 3-5 year range when all the 65'ers finally leave.

As for hiring....regional....Well it better be Compass!!!
We are so short now it is crazy. We could hire 20-25 tomorrow and that might help if we stop losing people. But wait management would have to pull their head out to see that.
Today alone I saw 2 captain/captain crews because we have no FOs. Oh did I mention we have no captain reserves either all with 11-12 days off!