I’m sorry if I missed where this has been answered, but on a recent flight my track shows me over land when in reality I was looking down on Lake Erie thinking it’s a long swim. The course seems to parallell my actual course, but is probably 20 miles off. Why is my flight shown this way?
I think what happened was your flight had lost radar coverage, probably due to being handled by Canadian radar. The flight was picked up again close to the destination, resulting in that long, perfectly straight line connecting the point of radar contact lost to the last point of radar contact before landing.