Originally Posted by
Cathay1101
AY did the trick.
...And then the BA system rejected the number, even though it begins 125- and appears correct. Humph.
Was the booking ever changed? If there may have been a ticket re-issue, try asking the AY website to email you the e-ticket receipt. You may get a receipt for every ticket associated with the booking, from which you can try to work out which one you actually flew on.