Ok, so you're saying Skywest is indebted to Delta and therefore Delta does not have to abide by their contract?
My example is less naive because a child is given an allowance by their parents for nothing, it is essentially a gift. A child is also essentially "owned" by their parents, the parents (within the law) can do with them as they wish, send them to the schools they want, decide which church they should go to etc. When a child "bites the hand that feeds them," the parents can act as they wish, cutting off allowance, restricting playtime etc....There is nothing out of the norm there and it is foolish for a child to piss off their parents for that reason, because they have no recourse. To draw an analogy saying DL is a parent and Skywest, their child is not accurate.
Your point, "Why would Skywest bite the hand that feeds them?" If Delta signs a contract saying we'll pay you X amount for your service...and then doesn't pay that amount, why have the contract at all? Should SKWY just take whatever pittance Delta sends their way because Skywest should feel fortunate to have a contract in these tough times?
By your logic Skywest or any other supplier should not actively seek to enforce a contract with a larger purchaser so as to not "bite the hand that feeds them?" Should SKwyest just chalk this up as a free-bee?