My personal opinion is that if you flip flop to many times between Corp. and Airlines you might become unattractive to both. In Corporate at the moment, they want guys who are current on type, so even though you might have the types, you will not be current in a few years of flying for the legacy carrier, if it all goes wheels up.
I think its a hard decision to make, but not the worst position to be in.
Good Luck!!