Originally Posted by
dujardin
I don't think that's the issue. Even if the ticket is on BA stock, you can't upgrade using Avios if the ticket contains sectors on non BA-metal, AND the ticket has been issued by a travel agent.
This.
From the rules:
Bookings made with a travel agent which contain other carriers cannot be upgraded.
https://www.britishairways.com/en-gb...ditions-of-use
http://www.flyertalk.com/forum/briti...vel-agent.html
That said a
couple of people have reported being able to upgrade using avios a TA booked ticket even with another carrier on the ticket. I didn't believe an OTA was involved.
http://www.flyertalk.com/forum/briti...ed-flight.html