I’m looking to book a round trip economy trip to Europe, and I’m looking to book an itinerary that only includes AA flights.
For my preferred return flights, AA doesn’t have any of the cheaper fare buckets left, but Finnair sells the preferred itinerary (all AA flights with AY codeshare flight numbers) for about $200 less than AA.
The fare includes one checked bag and as AA Platinum I will get a second bag for free no matter if I book the AA flight numbers or AY codeshare flight numbers, right?
What downsides are there to booking the AY codeshares?
If I book the itinerary on AA, I can change the flights and pay any applicable fare difference, and the same would be true for the AY ticket (“If you bought a Classic ticket on/after 15 June 2021 and change your booking, you only pay the fare difference between your original and new tickets, if any”)