Check in First!

Present your reservation number and passport, check in for your flight first, and leave your large.
baggage behind. Check the security checkpoint deadline, the boarding gate, and the boarding deadline.

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Security Checkpoints until 90 Minutes before Departure / Passport Control until 1 Hour before Departure

It's a good idea to watch each for about 15 minutes. There may be a long queue.

Dining and Shopping

If you need something that you missed in advance such as guidebooks, maps, conversation books, and souvenirs prepare them before boarding.
Communication: Shops for SIM cards, Wi-Fi routers, and mobile phones that can be used in Japan are usually located in the airport lobby.
Be prepared to have no inconvenience while traveling in Japan. Cash: It is safer to prepare cash (transportation, meals) that you will need immediately after entering Japan. Compared to other countries, cash payments are more common in Japan than credit cards and e-money payments. It is a good idea to check the rates and fees before using the exchange. Travel insurance: You can apply for overseas travel insurance at the airport although it may be included within the service of your credit card. Be prepared in case of an emergency.

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SIM card

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Wi-Fi router

Use the Airport Lounge

Use lounges operated by airlines or for credit card members. Generally it is available to members above a certain status. In many cases, free drinks and snacks are available, as well as power, Wi-Fi, and showers. Please note that limited services may be offered as a measure against infectious diseases.

Reference URL

United Airlines "United Club and lounge locations"
Englishhttps://www.united.com/en/us/fly/travel/airport/united-club-and-lounges/locations.html

ANA "Airport Lounges"
Englishhttps://www.ana.co.jp/en/us/travel-information/lounges/

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Last Minute Things to Do before Boarding

If you have not confirmed transportation or accommodations at your destination, it is a good idea to organize them while waiting before departure.
If you are trying to contact friends and acquaintances you plan to meet there, you should check them before departure.

Arrive at the Boarding Gate 30 Minutes before Departure.

Sudden changes in boarding times or boarding gates are possible. To avoid missing your departure flight, be sure to wait in front of the boarding gate as early as possible. If you have time before boarding time, check your hand luggage again and the travel schedule in Japan. It may also be a good idea to check transportation options online for what you will take from the airport upon arrival in Japan.