It bears repeating, though - one carrier appears more capable of "cashing in" on constrained infrastructure at LAX going forward, and that's the carrier that controls or nearly-controls ~2x the number of gates of any of their largest competitors at the airport.
No, quite frankly, they don't.
because there is not the limit on the ability of other carriers to grow that you think there is.
Just because AA has a number of gates in the pipeline doesn't mean there aren't ways for other carriers to grow.
And as much as you want to believe otherwise, it will be years before 9 or 10 of those gates are usable for mainline flights. Meanwhile, DL is positioned to move from being the only large RJ and mainline airline of the big 3 to being all mainline - 100 seats or larger.
and all of this size that you think will give AA an advantage comes from service to a number of 2nd and 3rd tier cities that AA serves and other carriers including DL do not see as necessary. Those cities do not have large amounts of O&D to LAX and local O&D traffic IS the best way to utilize scare assets.
You haven't demonstrated that you have understood the concept of O&D traffic and not just seats in the market when we have talked about Tokyo or New York so it is doubtful you will understand it WRT LAX but other carriers are simply much more focused on using their assets for higher yielding LAX O&D traffic than AA which has a need to have a hub on the west coast.
Other carriers have other hubs which serve the non-LAX local market and do not need to funnel connecting traffic thru LAX.
That is why the big 3 have never been closer in local O&D share and revenue from LAX. and will continue to be as DL and UA focus on adding what needs to be added to maintain and grow their share in the local LAX market.
further, the addition of LAX-SYD on AA aircraft is the lowest risk int'l expansion that AA could have done. It is a route being added in a JV where QF is already the dominant carrier and the number of seats in the local LAX-SYD market is not growing much if at all since AA's 77Ws have such low seat densities and QF is reducing their own service in order to fund the SFO-SYD flights.
The reason why this is big news to AA execs is because AA now gets to participate in longhaul revenues as part of the JV because they have their own metal in the OZ market.