Sometime in September, when CO had a sale from FLL<->LAS and FLL<->PHX, I made a double booking which was only noticed 24hrs after. The cost of $150 to change the tickets is more expensive than the $132 price of the entire itinerary itself. I am not too sure of how CO is accommodating to their PEs but I wonder if they will credit the miles for the other itinerary that I intend to check-in online but won't take the flights. Somehow, by not taking the flights which I could not actually fly, CO has the potential to sell the seats for a much higher price.

Has anyone had a similar situation like this before? Perhaps, CO Insider can shed some lights on this matter.

Thanks a lot.

David