I have pretended to buy a ticket with BA just now, return to lax from lhr, leaving next week. Interesting that it has allowed me to book, and
not once has it warned me that l wont be permitted to go, being a uk citizen. Trying to find out you CAN go in the first instance isnt easy , so l havent bothered.
the flight is the 269 out, 268 back on the microlight 787.
Good luck in the minefield of finding where you can and cant fly to.