Originally Posted by
gtomlinson
No you can't.
Got to be used on the phone where they'll waive the offline fees
''If you wish to use your MCO for payment towards a flight booking you must book through your local British Airways Sales office, Customer relations or your local Travel Agent, as MCO payment cannot be accepted on ba.com.''
The original question was whether it could be used at the airport for an airport upgrade, not whether it could be used on ba.com. In line with your extract above, would it not be possible to talk to Customer Relations at the airport?