changing FF number at the gate
Asked a GA to change my FF number before boarding - she tried but couldn't. Tried the agent at the Delta "help centre" in the terminal. And at the Skyclub.
All of them told me that the FF number could not be changed "after my travel had begun". DL stock, DL metal, third leg of TATL 8 or so.
I've had no problems doing so before - any ideas why this might be happening ?