Just booked JFK-LAX yesterday, for a trip tomorrow. Requested via Twitter to waitlist a RUC. After making the request via Twitter, I got a new copy of my itinerary, showing the RUC waitlist (which I'd never seen before):




Tried to check in at T-24, and was unable to (got an error message). Called in to the Diamond line, and was told they were processing the RUC while we spoke. Hung up, and the RUC cleared!