Originally Posted by
ijgordon
On CO, there is a fee for changing just the date/time within 21 days. I don't think it's 100% clear, but if they mean within 21 days of the new flight, then there's no loophole. If they mean within 21 days of the original flight, then there is a loophole. FWIW, I believe AA has this loophole, as they don't have the 21 day restriction on fee-free date/time changes.
This is interesting. Has anyone exploited this loophole on CO? I was unable to get a booking in before the June 15 window and sure could use this loophole.