I've now looked up my 748 reference, so I'm out ...

The first US one was N748LL for Air Illinois, delivered 10 October 1973. It had been sat at the Hawker factory since being built 12 months earlier, presumably waiting for FAA type certification. It was on its own in the US until January 1981 when they got a second new one. In contrast Canada, which like most of the rest of the world has always accepted UK certification, was an early adopter and worked through a huge number, almost all secondhand, once they found it's usefulness in the Northern tundra on loose runways which didn't suit the high wing F-27. Canadians generally just called it the "Hawker", nowhere else did. Caribbean and Latin America also had considerable numbers across many countries; strange it never sold well in the US.

The Aeromexico flights were operated by a regional carrier, in the 1960s Aeromaya, which passed their fleet across to another operator, Saesa, at the beginning of the 1970s, with an Aeromexico-lookalike colour scheme with the orangey-red cheatline.