Thinking of traveling around Japan by plane?   It may not seem like the obvious choice, but may be worth looking into depending on where you are and where you want to get to.  Many people travel within Japan up to Hokkaido by plane.  Flying can be faster than train travel and at the same time can work out to be about the same or not much more than using the trains. 

Most domestic airlines use the Haneda Airport for internal flights, while all international flights use the Narita International Airport in Chiba which is about 1 hour from central Tokyo by train. 

Check out Tokyo section for more information about getting round Tokyo and it's airports.