About 6 or so months after 9/11, a 727…I think AA….was headed to DFW from I believe SAN. Had some kind of radio issue and wasn't answering ATC east of EWM. The closest and only fighter jets available to make an intercept were German Luftwaffe Tornado IDS jets and F-4F Phantoms out of HMN that were not far to the north in the R-5103 area and were vectored by ZAB to intercept and go take a look at what was going on. Turned out it was a simple radio issue, but one could imagine seeing Luftwaffe jets marked with the Iron Cross pulling up alongside.
And had it been a 9/11-style hijacking where a shootdown was deemed time critical and necessary for some crazy reason? Would be German AF fighter jets being directed to shoot down a US-registered civilian airliner of a US airline over US soil and airspace…….wow.