[QUOTE] No. The other way around. You can earn points on AA as you normally would if flying BA, as well as BA On Business points for the trip. You, obviously, wouldn't earn Avios points then.
https://www.britishairways.com/onbusiness/how.shtml
Travellers enrolled in British Airways Executive Club® or other qualifying partner programmes will still earn miles in their personal accounts while earning On Business Points for their company.
Bottom line: you have to fly BA to earn BA on Business[/QUOTE]
How do you conclude that you have to fly BA? This site says:
https://www.britishairways.com/en-us...el/on-business
- Earn On Business points with American Airlines, British Airways and Iberia, which can be redeemed for reward flights and upgrades
- Choose money off selected flights across our global network
- Fly On Business and continue to earn personal Avios through the Executive Club, Iberia Plus or Avios Programme