For limited express reserved seat tickets, even when you miss the train, you will be entitled to be seated in an non-reserved seat in an Ordinary car on a later train on the same day. However, if you use a reserved seat, you will be required to pay the full amount of the Limited Express reserved seat charge.

If you miss your scheduled Narita Express (N'EX) train, the outcome depends on the type of ticket you hold. Because the N'EX is an all-reserved-seat service, your specific seat reservation is technically void once the train departs. However, JR East policy generally allows you to use that same ticket to board a later N'EX train on the same day, but you will not have a guaranteed seat. You must stand in the vestibule area or sit in an unassigned seat until a passenger with a valid reservation for that seat arrives. If you have a JR Pass, you simply go back to the ticket office or a reserved seat machine and book a new seat on the next available train for free. if you bought a regular paper ticket or used a digital Suica/Pasmo, you can go to the "Midori-no-madoguchi" (ticket office) and a staff member can often help re-issue a reservation for a small fee or for free depending on the fare type. If you are in a rush, you can also opt to take the "Keisei Skyliner" (if at the airport) or a standard rapid train, but these are different companies and would require a new ticket purchase.