for every tail, there is a head wind. we once had to stop in iceland to gas up on a muc-iad flight. very cold, and lots of wind. we got dumped on the tarmac in the dark, and were told not to let go of the rope(ran from plane to airport)

bought lots of iclandic wool sweaters

came back recently from lhr to iAd. we dropped south of england, and did not take great circle route. head winds were under 10 knts.