A commercial flight from New York to Tokyo takes the route over Europe or Continental U.S?

It depends on which airline you take. Most US and Asian carriers will head west over Canada and Alaska, but you can take European and other airlines that will head east over Europe.

There are many non-stop flights from JFK to Tokyo, all of which head west over Canada and Alaska. United, American Airlines, Delta, ANA and Japan Airlines all offer non-stop flights to Tokyo from NY.

You can check prices and get flight details here: http://www.kayak.com/flights

Continental US, first you Take off from New york head north towards Canada, and then diagonally go towards Alaska, then Some part of Northern Russia and head down to Tokyo! It's 10900km (6775miles) trip, lasts about 15-17 hours by plane in direct flight.

Tokyo is the capital of Japan, and the place where over 13 million people live, making it one of the most populous cities in the world but also, a big city to visit, find out more with hotelbye . Most of the city was devastated by the Great Kanto Earthquake of 1923, and then again by the bombing in the WWII, however, Tokyo was able to achieve a remarkably rapid recovery both times. The main attraction of Tokyo is the Imperial Palace with its beautiful 17th-century parks surrounded by walls and moats. The palace is still in use by the Imperial family.

Jfk To Tokyo

It flies west over Canada in the direction of Alaska.

Flies over Canada and Northern Alaska, then skirts Russia.

LaGuardia to Narita

http://www.gcmap.com/mapui?P=lga-nrt&DU=mi&SU=kts

Neither, it flys over the North Pole and over Alaska, which is not considered Continental US.

Neither. (Look at a globe.)

Edit: Well, unavoidably, it flies over some CONUS, but mostly neither.