Regional Question:

When mainline carriers contract with a regional to provide feed, are there specific reasons that the mainline carrier can void the contract? My thinking is that like certain financial instruments, if xyz goes below abc then you cash us out. Do the mainline carriers state "if your balance sheet looks a certain way, and your potential liabilities exceed your net worth, we can void the contract and go with another regiona in better financial shape"? Similiar to a loan convenant with a bank - does this exist in the regional world, and if so, I wonder if Mesa's balance sheet is getting close to triggers?