I've got a stack of 'em, courtesy of a very kind person at UA. They all expire on May 31 and state that travel must be completed by then as well; however in practice the travel-by date is not enforced, just the ticket-by date. They also state that they are good for Y, C or F fares for travel within the 50 states and Canada and require a roundtrip and a Saturday night stay (which I just verified is, in fact, the case). Shoot me a message if you can make use of one by then - I'll sort through the replies in the morning. My apologies if I'm not able to respond to everyone personally. EDIT: Each cert is good for up to 4 passengers per itinerary.