Originally Posted by
bwmiller87
I had this issue booking a flight the other day too. It wouldn't allow me to book using a FFC. Instead of calling, I sent them a DM on Twitter, and they were able to book the flight for me through there. Much easier than waiting on hold for who knows how long...
Did you try using the FFC as a payment method of a new booking versus starting with FFC and trying change it to the new flights?