Originally Posted by dvs7310

If you actually mean taxes (meaning government imposed charges) then no, they are the same for any carrier serving an airport. But if you actually mean YQ / YR then yes it varies significantly depending on ticketing carrier / marketing carrier / departure point, etc. Those are wildly variable. You may experiences increases or decreases in total price, especially ex- CAI and ex-OSL. ex-Japan is a lot more stable since there's no YQ. And yes you most likely have lower surcharges on a JL code than BA since BA is one of the worst offenders in the entirety of the oneworld alliance.





Absolutely not, it's either available or it's not. They can't just push availability in normal circumstances. But availability may be a bit different than you can see on your own.





Careful about that because they'll generally require at least one AA long haul segment on an AA code. Additionally they have been known to disallow using non-AA codes on AA metal in the past. Sure they'll allow you to use any codeshare you want aside from those flights, but that can be significant.


Example on my next RTW itinerary I have:

HND-JFK (JL)
JFK-GRU (AA metal JL Code)
GRU-DFW (AA metal JL Code)
DFW-STL (AA code)
STL-SEA-DOH (AS, QR codes)

That would never in a million years be allowed by AA RTW desk. And would be detrimental to an AAdvantage member if it wasn't JL, AS, and QR coded.