AA has not tied up the lose ends with the merger yet, but neither has UA/CO ... or DL/NW. It takes over a decade to merge fully.
I fly AA almost exclusively, not just because I have elite FF status (which I do), but because they have the best on time performance to the airports I fly to. WN is just abysmal out of LGA/JFK, and B6 forces me entirely to JFK, while AA has basically a shuttle that goes LGA-ORD and JFK-LAX, which are two of the major routes I fly. Plus, WN and B6 don't fly internationally to speak of, and I have at least one mid-haul international sector per year as well. By sticking with OneWorld, I get big bonuses.
That said, if it's your once per year flight, I wouldn't worry too much. I fly A LOT, and honestly they're all about the same for OTP and lost luggage, but the not insubstantial perks of free first class upgrades and such really do add up.
Also, for Laura Kelly, flying out of SHV, I'd take DL or AA as they have the most frequencies to the hub and avoid WN which currently does not service SHV at all. Out of DFW vs DAL, it's hands down you should go out of DFW. WN has almost zero presence on that route, and AA is very heavy, so even if you have a cancellation or delay, you still get out close to on time - with WN, you'll be pushed 1-2 days until the next available flight with seats on it. Schedules are posted 330 days in advance across all airlines nationwide.
I fly AA almost exclusively, not just because I have elite FF status (which I do), but because they have the best on time performance to the airports I fly to. WN is just abysmal out of LGA/JFK, and B6 forces me entirely to JFK, while AA has basically a shuttle that goes LGA-ORD and JFK-LAX, which are two of the major routes I fly. Plus, WN and B6 don't fly internationally to speak of, and I have at least one mid-haul international sector per year as well. By sticking with OneWorld, I get big bonuses.
That said, if it's your once per year flight, I wouldn't worry too much. I fly A LOT, and honestly they're all about the same for OTP and lost luggage, but the not insubstantial perks of free first class upgrades and such really do add up.
Also, for Laura Kelly, flying out of SHV, I'd take DL or AA as they have the most frequencies to the hub and avoid WN which currently does not service SHV at all. Out of DFW vs DAL, it's hands down you should go out of DFW. WN has almost zero presence on that route, and AA is very heavy, so even if you have a cancellation or delay, you still get out close to on time - with WN, you'll be pushed 1-2 days until the next available flight with seats on it. Schedules are posted 330 days in advance across all airlines nationwide.

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