Be careful if you have a large sick bank. I was at a regional that shut down twice. First time it shut down I was out several hundred hours of sick time. I wasn't able to accrue much when it shut down again.
That's significant money especially if your a captain with decent time on property. When Spirit shuts down I'm not sure how long you will wait, or if, you will get compensated. Even then, they may be a hefty discount especially if the liquidation is messy with the creditors.
I'm somewhere else now, and while it sucks to be commuting at the bottom for a few months, I'm at least not waking up wondering if my company will be around in a month. I guess it's about picking what problems you want to have. Some are better than others when it comes to my mortgage.