http://www.airplanessale.info/boeing-777-aeroplane/
Can someone explain this to me?
Ok, bear with me here -
The world spins in such a way that if you were able to hover in mid air, you would float to America if you started in the UK. So, considering this fact, why does it take a Boeing 777 aeroplane, 8 and a half hours to fly from London to Washington, but only 7 and a quarter to fly the same distance from Washington back to London?
Jerry C: That’s exactly what I thought, but it should make the trip from London to Washington shorter.
Thanks for the answers about the “gulf stream”, I’ll check that out.
Tim S: So it’s a bit like the way water drains in a different direction in the southern hemisphere… Very interesting, thank you 
)
Good answers regarding the jet-stream, but lets break it down further, and let me clarify a few things as well.
The routes that aircraft will fly back and forth from Europe to North American and vice versa, change daily to take advantage of the jet stream. At certain times of the day, the routes are one-way only to permit more aircraft along these routes at different altitudes. Flying transatlantic is a complicated process to explain fully and deserving of another question in Answers. But I digress. That’s the quick 30 second version of it, a full explanation is about novella length.
Jet stream winds over the Atlantic Ocean are primarily west to east. They can get up to 130-150 knots per hour (kph) , and it’s not uncommon to see them frequently at 80-100 kph. So you can see how a tailwind component could shorten the estimated time enroute significantly.
Just as an example. Today I was working at sectors that were experiencing 90 knot winds from the west. Aircraft that were going east had roughly a 510 knot ground speed and aircraft headed in the other direction had about a 400 knot ground speed. Obviously, travelling to the west will take a bit longer than going to the east.
I hope I didn’t lose anybody, and tried to leave out technical jargon.
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