Miyazaki Kūkō Line

Miyazaki Airport had been opened to civilian use in 1956, but for decades no railway ran directly to it. There was a distant precedent: from 1954 to 1962 a station called Hikōjō-mae (also recorded as Hikōjō Station) had stood on the Miyazaki Kōtsū Line, the predecessor of today's Nichinan Line, serving as the nearest station to the airfield. When the Miyazaki Kōtsū Line was abandoned that station closed with it, and the Nichinan Line built in its place did not include a stop there, leaving the airport without a rail connection.

The impetus for a dedicated airport line grew out of a corporate transport problem and a tragedy. Asahi Kasei, whose founding factories lay in the city of Nobeoka, generated heavy business travel between Nobeoka and its head offices in Osaka and Tokyo, yet at the time there was neither a fast rail link nor an expressway between Miyazaki and Nobeoka, and the railway did not reach the airport. To bridge the gap, in March 1989 the company opened a helicopter route connecting its Nobeoka plant with Miyazaki Airport in about twenty-five minutes, a service expected to carry some 15,000 employees and 6,000 visitors a year.

On 27 September 1990 one of those scheduled company flights, bound from Miyazaki Airport to the Nobeoka heliport, crashed, killing everyone on board in what is known as the Hankyū Air charter crash. The helicopter operation was abandoned, and in its wake momentum gathered swiftly for improving transport in the region — both for upgrading the Nippō Main Line for higher speeds and for using the nearby Nichinan Line, which passed close to the airport, as the basis for airport access by rail.

Construction of the connecting line began on 28 July 1994, and the line opened on 18 July 1996, three decades after jet services to the airport had begun. At the same opening Tayoshi Station was re-established near the junction with the Nichinan Line to serve as the new line's origin; Tayoshi had earlier been closed in 1971. With the opening, rail access to the airport was restored after a gap of thirty-four years, ending the long period in which Miyazaki Airport had no station of its own.

In the years after opening the line was gradually modernised. One-man operation began on 1 October 2003, and on 14 November 2015 the SUGOCA contactless IC card became usable in the Miyazaki area, including on this line. Real-time train-location information followed: a positioning feature within the JR Kyushu smartphone app went into service on 22 December 2016, and a further real-time system, "JR Kyushu Train Navi," launched on 26 January 2026. The COVID-19 pandemic briefly cut services, with reductions running from 20 March to 23 April 2020.

Administratively, the line passed from JR Kyushu's Kagoshima Branch to the newly established Miyazaki Branch on 1 April 2022. A timetable revision on 14 March 2026 reshaped daytime services: the sightseeing train "Umisachi Yamasachi" began running onto the line in the down direction and stopping at Miyazaki Airport Station, and a clock-face pattern timetable was introduced over the middle of the day, giving the short airport line a regular half-hourly rhythm of limited expresses and local trains.

• 1956Miyazaki Airport is opened to civilian use, but no railway runs directly to it.
• 1962Hikōjō-mae Station on the Miyazaki Kōtsū Line — the airfield's nearest station since 1954 — closes when that line is abandoned; the successor Nichinan Line builds no station there.
• 1989March: Asahi Kasei opens a helicopter route linking its Nobeoka plant with Miyazaki Airport in about 25 minutes, to compensate for the lack of a rail or expressway link.
• 199027 September: a scheduled Asahi Kasei helicopter flight from Miyazaki Airport to Nobeoka crashes, killing all aboard (the Hankyū Air charter crash); momentum grows for rail-based airport access via the nearby Nichinan Line.
• 199428 July: construction of the connecting line begins.
• 199618 July: the 1.4 km line opens, 30 years after jet services to the airport began; Tayoshi Station (closed in 1971) re-opens as the line's origin, restoring airport rail access after 34 years.
• 20031 October: one-man (driver-only) operation begins on the line.
• 201514 November: the SUGOCA contactless IC card becomes usable in the Miyazaki area, including on this line.
• 201622 December: a real-time train-location feature within the JR Kyushu smartphone app goes into service.
• 202020 March – 23 April: services are reduced because of falling ridership during the COVID-19 pandemic.
• 20221 April: jurisdiction over the line transfers from JR Kyushu's Kagoshima Branch to the newly established Miyazaki Branch.
• 202626 January: the "JR Kyushu Train Navi" real-time train-position service launches. 14 March: a timetable revision brings the "Umisachi Yamasachi" sightseeing train (down direction) onto the line to stop at Miyazaki Airport, and introduces a half-hourly daytime pattern timetable.