In April, I have a flight from GPS-GYE-PTY then into DEN the next day. Assuming no issues, I arrive in GYE around 1pm and my flight to PTY is not until 6:30pm. It looks like there is a 3:30 flight I would love to get on.

I am on an award ticket booked via United (business) and was wondering if anyone had any experience flying standby on Copa. It looks like I can call 3-24 hours ahead and try to change for a fee, or the website says you can do standby 3 hours ahead at the airport. Anyone have any experience or luck with standby on Copa, any tips? Any potential issues being tbooked through United on points?