By 'south of the Rio Grande', I mean 'into Mexico' rather than 'anywhere south of 31N' - I thought this was standard usage, but various of my friends in Cambridge interpreted it the other way.
Transatlantic flights can depart from great circle quite a lot, though - further North (or a lot further South) when going Westwards, usually (it depends where the jet stream is - going West you want to avoid it). I flew LHR-LAX recently and probably just avoided the Arctic Circle, but went over the tip of Greenland.
no subject
Date: 2010-03-31 07:35 pm (UTC)