Here are top busiest International Airport in Japan.
Haneda Airport HND (Tokyo)
Narita International Airport NRT (Chiba/Tokyo)
Kansai International Airport KIX (Osaka)
Fukuoka Airport FUK (Fukuoka)
New Chitose Airport CTS (Hokkaido)
Naha Airport OKA (Okinawa)
Osaka International Airport ITM (Osaka)
Chūbu Centrair International Airport NGO (Nagoya)
If you are flying to Tokyo, you will be likely landing at Narita or Haneda. If you are going to Osaka, you will be likely flying to Kansai, unless you are transmitting from Narita to Haneda.
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