If there are no seats left on your preferred flight, you can use one of the following services to make a standby request: Standby at the Airport or the Waitlist Reservation Service (an online service).
The Waitlist Reservation Service is available exclusively for ANA Mileage Club members, and enables them to make a standby request on the ANA website.
Requests can be made from the ticket's sale start date until 2 days prior to departure. If you have a fare with a limited sales period, requests can only be made during the sales period.
Standby at the airport enables any passenger to make a standby request on the departure date* if there are no seats left on their preferred flight. The request must be made no later than 20 minutes prior to the departure time of the preferred flight.