Can I bid for more award miles than I have in my MileagePlus account?
No, you cannot place a bid higher than your award miles balance at the time of placing the bid. MileagePlus will not, however, track your available award miles during the bidding process. It is your responsibility to make sure that you do not cumulatively bid more award miles than you have in your account, among all the items on which you are bidding or using in other MileagePlus channels. . Your bid is an offer, and when bidding closes, if you are the highest bidder, your offer has been accepted and a valid, enforceable obligation is created. Therefore, you must bid carefully and be aware of how many award miles you have and how many bids you have outstanding. If you are declared a winning bidder at the end of the auction, and you do not have enough award miles to cover your bid, all of your bids for that item may be deemed null and void. MileagePlus will reserve the right to award that item to the next highest bidder with sufficient award miles in their account.