I don't think he could have been working for a British company. According to a mini bio he "...left Scotland for America in 1972. He lived in Alaska for 15 years..." how many company's were flying the London - Ancorage route back then?
He also claimed to have a “degree in aeronautical engineering from the University of Edinburgh” but a} the school does not offer such a degree
b} it has not offered since at least 2002 (the oldest page I could find on the Internet Archive}
c} Google searches turned up no references to the university ever offering such a degree or anyone else claiming to have taught or studied the subject there.
So he seems to have been making up a background in aviation.