FlyerTalk Forums - View Single Post - Destination and Alliance change: Fees involved?
Old May 11, 2017 | 1:11 am
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NWIFlyer
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Originally Posted by Ldnn1
1. BA will not check bags through to UA, so you will need to purchase whatever baggage allowance they require for the UA flight.

Plus, to add, even if you chose to book a oneworld flight from IAD to one of the Bay Area airports, BA would still not through check on separate tickets - so there is no advantage whatsoever to you in baggage fee terms with remaining within the single alliance.
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