Hovercraft had been used in Japan since the latter half of 1960s, including along routes between Kumamoto city and Shimabara city and routes in the Seto Inland Sea. However, none of these remain in operation today. In Oita Prefecture, a route to and from the airport was established in 1971 and used by around 400,000 passengers annually at its peak in the 1990s. However, as passenger numbers declined, Oita's hovercraft service was discontinued in 2009. Recently, the prefectural government began to reconsider using hovercraft to improve access to Oita Airport, which is an hour from Oita city by express bus. The prefecture decided to pay for the cost of the vessels and boarding terminals, while a private company will operate the hovercraft. However, since navigation and operations training began in November last year, four accidents have occurred—including hitting a guardrail beside the route and crashing into a seawall. These issues have delayed the start of the operations by nearly a year.