I've flown over parts of Canada as a passenger many times. When you travel from the UK to the US, the plane goes over Canada first, and then South in to the US. That's the rules of the one-way-system I guess. Planes that leave the US for the UK just leave the East coast and do a straight-shot. It takes 7 hours. The return journey takes 8 hours because of the Canadian route. They don't want inbound and outbound planes to collide.
But, other than that, no, I haven't.
This post was edited by righty1 at December 17, 2017 12:35 PM MST