warning re. poor customer service, when I called to try get on an earlier flight was told promo fare was not changeable rather had to be cancelled and rebooked (risky), "Standby is not availble on award fares" ! and when asked for contact # for airport check-in desk (UK) was told to google it! (there is no number) otoh when the booking agent was super helpful and followed up by email to confirm my fare etc. so YMMV..