• I booked all the flights through BA.

    The consensus seems to be that if you book/check-in with BA then there's no problem (this isn't the policy as-written though as BA state they won't be held accountable if partner airlines add extra fees for your luggage).

    You're not going to interact with any AA staff till you're on the plane and by then it seems a little late to ask for the bike fee?

    I guess it's possible that BA could ask for the bike fee on behalf of AA, but that doesn't seem to be happening at the moment.

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