It does lead to a question about how happy different branches of the US government are with each other.

I don't know how any of this works though; assuming everyone else was cool with it, does the FAA need to be consulted in such a scenario? Does the FAA have worldwide jurisdiction over launches by/for USA companies?

This will presumably matter in the (IMO unlikely) case of suborbital city-to-city civilian transport via Starship launches.

> Does the FAA have worldwide jurisdiction over launches by/for USA companies?

Yes it does. Per https://www.faa.gov/newsroom/commercial-space-transportation... "An FAA license is required for any launch or reentry, or the operation of any launch or reentry site, by U.S. citizens anywhere in the world, or by any individual or entity within the U.S. "

So the FAA might object, but the EPA's hands would be tied.

Other defense and aerospace contractors also operate in Mexico.

Are they buildings ng ITAR stuff there, or parts which are not sensitive?

Details matter