I spoke with two Elite Desk reps tonight trying to do a SDC swap on my flights tomorrow. Both reps stated that the original booking class must be available to do a SDC swap.

All fine and good, except that very, very important distinction is missing from all of CO's press releases and online descriptions of the service - or is buried somewhere.

I think this rule should be very prominently displayed on the online info page, even bolded for extra emphasis. Had I known the same fare class needed to be available, I could have checked that ahead of time and not wasted the phone calls.

I'm pretty certain that in most cases, within 24 hours of departure, having the same fare class (especially sub-V) available is right around 5%.