Are you walking around in a daze? "Oh, I just remembered! I used to WORK for National Air Cargo! Oh, my!"
Obviously not. I used to work for Air Atlanta Icelandic and they hired out their crews and aeroplanes to other airlines. In my time with them I flew for something like 10 - 15 other airlines, so it was entirely possible that the crew of the American company 747 was in fact Icelandic.
But it turns out that even though AAI used to own that aeroplane, they probably sold it to National Air Cargo some time recently.
Condolences to the crew and their families.
