What are UA's assets worth?
South America= worthless, anyone can fly to Brazil and Argentina if they want.
NRT= $1,000,000,000, if you can get it, Do DAL or AA have this much spare cash around(BIG IF).
LHR= $600,000,000, CAL and DAL are the 2 main airlines interested but again the price may not be right.
ORD, LGA, DCA slots are worth lots but will be most wanted assets UA has.