My former MP also had a problem with that - something about needing to use his UK diplomatic passport for an official visit and the Americans not being terribly keen on that (I've probably got the details wrong, but point is, it isn't just Boris). Nothing that some seriously high powered people running around phoning each other out of hours couldn't fix, but it was still a hassle.

Yes, with one or two states, I certainly can.

As an early replier noted, "...well, it is their country!" I'm sure that Cuba and the U.S. will eventually get this worked out. A lot of Americans want to visit Cuba and Cuba certainly wants the dollars. Flight crews were singled out this time, but the problem involves far more Americans. Diplomatic processes are often slow - or worse -, but they two countries will get it worked out eventually!