I booked an award seat on tomorrows PHL-LHR a month ago. So far, it looks like it will go. I called US today to try to cancel it to allow stranded pax go, and told them I could rebook in June or get the miles back--but no dice. They told me I had to pay a $250 redeposit fee...so guess I'm going tomorrow...hoping for VDB...and pissed at US for not allowing me to give up my seat to people who have been stranded here for days.