For travelers with a long layover at Tokyo Haneda en route to Canada (e.g., a 16-hour connection):
- Generally, no Japanese transit visa is required if your connecting flight departs within 24 hours of arrival, even for long layovers like 16 hours — as long as you remain within the transit area or don't need to formally clear immigration.
- Check whether your itinerary involves a terminal change at Haneda, since switching terminals can sometimes mean passing through Japanese customs and immigration, which changes the transit requirements compared to staying airside.
Transit visa rules depend on nationality and specific airport transit facilities, so verify current requirements with the airline or Japan's immigration authority based on your passport and exact routing before travel.