Originally Posted by
mudd_stuffin
What you experienced is technically appropriate. The booking agency (Cheapoair) has control of the booking and AC is technically not supposed to modify the booking. Cheapoair has the ability and the obligation upon request to add your MP number and assign seats.
While there may be a space in the itin, there are no spaces in plane tickets.
When I called AC after I made my booking, the agent added my MP number for me without any issue. He also gave me free bulkhead seats for the flights to and from HKG, which are supposed to be reserved for AC elites.
I'm not even a UA elite yet (that happens tomorrow). Maybe he was in a good mood or something.