Originally Posted by
canadiancow
All of this is subject to the usual "these are the rules, but agents have the technical ability to do anything, so you might get around it" caveats.
You have to do it on the same calendar day based on your departure airport.
Both your cabin and the flight need positive space. J2 O0 Y-2 is not valid. It doesn't matter what they're selling, just what the loads are.
So the option did not show up online when checking in at 00:45 am. Or later. I called the concierge. She insisted that same day change is $100, but standby is free. However my reservation shows free same day change, no standby... Anyway, I paid. Changed to a flight which had 4 J seats, -2 in Y. I can totally imagine that the rules I see and the rules the concierge saw differed. (For instance, reservation shows change fee $400 but the IPhone app says $200...) Time to send a complain to Customer Solutions?