To and from Hong Kong International Airport at Kai Tak
First two airport bus routes were 200 and 201 operated by Kowloon Motor Bus ("KMB") since 1975, using mainly Albion Viking EVK55CL coaches. From 1985, these non-air conditioned coaches were replaced by air-conditioned Dennis Falcons. Shortly after the change, the services were specific named as "Airbus" and the 2 routes were re-structured and broken into Route A1, A2 and A3. Route A4, A5, A7 and A8 were then launched in different periods, but Route A4 and A8 were repectively cancelled. Dennis Darts and Lances were introduced to replace most of the Falcons in 1993.
KMB was the sole operator of franchised airport bus services until 1995, when China Motor Bus ("CMB") introduced Route A20 with Carlyle and Marshall Darts on September 17 of the year.
All the airport bus services for Kai Tak were terminated since 6 July 1998, when the replacement airport at Chek Lap Kok commenced its operation. The new airport bus services are operated by Long Win Bus, Citybus and New Lantao Bus.