DAL borrowed $600M, put it in escrow, to be paid to pilots upon completion of contract/SLI. $400M is pennies to these companies.
We'll see, 400M is more than a typical quarterly profit during good times even for a large airline, it's certainly not pennies especially when added to the other costs that come with an improved labor agreement. Retro pay is very tough to get because it's a big chunk of money all at once but who knows, maybe it will different in this case.