Originally Posted by
jsloan
Because OP already has a Q ticket on the flight in question. UA isn’t asking them to open any new inventory.
Counterexample. On UA to boot. You upgrade with an RPU ... and you want to reverse it. Not possible unless the original fare class is available. And yes, UA could do this, but they won't! And the reason is obvious, this is a voluntary change ... like changing from UA to LH code ... it requires inventory to be available.
If you buy a ticket and right away change it to native flight numbers ... it is pretty much not an issue. So that is SOP that one should follow.
Can it be done. Sure it can be done ... but it is not SOP and I don't have any knowledge that this has worked in the past. In my experience, positive inventory available ... no problem. Otherwise ... YMMV.