If you are planning a flight from Tokyo to somewhere, Haneda airport is one of the choice. Most of lines are domestic, but some international lines are available. The airport ranked No.2 in The World’s Best Airports in SKYTRAX World Airport Award. (https://www.tokyo-airport-bldg.co.jp/en/files/whats_new/919_0328_0616.pdf )
…Wow. It is excellent, isn’t it? I don’t recognize the greatness, but it must be great because the rank is near from the top.
It also ranked No.1 in World’s Best Domestic Airports and World’s Cleanest Airports in the same award.
Oh,,,I didn’t know the airport is such a wonderful one.
There are International terminal and Domestic terminal. Both of them have an observation deck to see many airplanes’ arrival and departure.
There are also a lot of restaurants/ souvenir shops, so, you wouldn’t get bored.
Traveling between International Terminal and Domestic Terminals
You need to use transportation for traveling between International/Domestic terminal because each terminal is a completely different building. I recommend a free shuttle bus which comes every 4 minutes.
*Other transportation, Tokyo Monorail and Keihinkyuko Line(Both of them are trains) are paid service.
Many public transportations are available from Haneda airport. They help your transfer to the city of Tokyo and Narita International Airport.