I believe the current one was privately funded by the Mayan Palace group, which explains why it is located to their benefit. But its ridiculous to have it located 30 minutes from Sandy Beach on a horribly maintained road. The Mex gov't would need to step in (what's one more boondoggle?) and build a new airport in a more strategic location with clean & efficient access.
I have also heard that it is a very cool setup in the TJ airport- you can park on the US side of the border in CA, then walk across the border *directly* into the TJ airport. Then, as you say, you can fly to anywhere in Mexico *without* having to go through customs. If I lived in Southern California this would be a *really* cool option.Would you still have to go through customs if you flew in from Mexico? Brother in law from Orange county CA is excited about it. He says easy peasy to just walk over the bridge to TJ airport from San Diego.