Originally Posted by
VPescado
While not an expert, I can not imagine any way for the "system" to deny you boarding for a flight in which you:
1) Have a confirmed reservation on a flight
2) Have a ticket (or e-ticket) with a coupon (or e-coupon) that is valid for that flight.
3) Checked in within the required time frame.
Denid boarding, I have no idea. But denied check in, yes, it happened to me.
CA denied to check me in even though I:
1) had confirmed reservation. (at least in UA's system)
2) had valid e-ticket which was issued by UA. (an award ticket)
3) came to check in counter in time.(1:15 h before departue time)