Interesting. I didn't realise that Business Extra and On Business differed in this regard.

One can of course credit BA marketed and operated tickets to Business Extra, as BA's online booking process includes a specific area in which to enter an AA Business Extra number. But to be clear, it is not possible to do the opposite, and credit AA marketed and operated tickets to On Business?

I had presumed that the two programmes had equally reciprocal earning schemes, but come to think of it, I have never actually tried crediting an AA marketed and operated flght to On Business.

It would be interesting to know how this works within the joint venture in terms of accounting. No doubt there is some reason why the earning benefits are not reciprocal.