SD isn’t going to build a second airport. It would take 30 years to get through the enviro-nazi lawsuits.
How many decades did it take to get the runway extension alone done there?
I’m sure the “toll fee” is to break even for the customs cost, and the real (potentially BIG) profits will come from car parking in the much more secure USA.
The big benefactor of this is Volaris (basically Southwest Airlines of Mexico) started by America West CEO Bill Franke, and Indigo Partners, the same company that just bought Denver-based Frontier Airlines.
I forgot to add that the car rentals will also be on the US side, too, which will cut the theft rate, dramatically.
I could see this becoming a big deal in the next decade or so, with longer-haul flights from TJ to southern Mex/Latin and South America. (Which is likely exactly the Volaris plan.)
The catchment won’t really effect LAX, and it won’t mean a bunch of TJ-US flights, even with the Southwest/Volaris code share. It will pull from the SD catchment, southern LA burbs.
I could see Frontier adding a few flights, years down the road, to tie into Indigo-owned Volaris southbound flights, but not many.