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The free overnight paid by the airline -- who does that apply to? I know All Nippon doesn't do it (I called them); also, does it matter whether you're traveling form US or from Europe?
i know JAL give you a free overnight between Australia and europe when there isn't a convenient connection.
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I also agree that the train is easiest to get to Narita. There are also buses but better to just keep it simple. Just... more
There is a bus that goes between the two airports. http://www.limousinebus.co.jp/en/ more