Originally Posted by
ATOBTTR
We even did this internationally though kind of the opposite. We booked a ticket under the married name but then for a lot of other reasons, never got around to having my wife change her legal name from her maiden name. Her passport was under her maiden name, while the ticket was under her married name.
I am glad to hear that it worked out. If I was an agent, I would be less concerned about the OP's situation (ticket in the old name + proof of old name on old ID + proof of the name change bridging the gap between the two) than your situation where the ticket was in the future name but which had not been done and they would have no official confirmation that it would ever be done in the future. I don't know how the checking of passengers against "do not fly" lists or various other issues work but in your situation the ticket was in the name of someone who did not "exist" yet in the system, so to speak. To make matters worse, it was an international flight.
Anyway, good thing that some dose of common sense prevailed.