It links the urban area with Hong Kong International Airport and the AsiaWorld–Expo exhibition and convention centre.

[4][5] The government invited the Mass Transit Railway Corporation to build an express line to the airport.

The project began when the Chinese and British governments settled the financial and land agreements in November 1994.

With the opening of AsiaWorld–Expo, the line was extended to AsiaWorld–Expo station on 20 December 2005 and a journey on the entire route takes 28 minutes.

It crosses beneath Victoria Harbour before stopping at Kowloon station, which was built on reclaimed land.

[8] On the trains, there are luggage racks next to each door, and each seat is equipped with in-seat loudspeakers for current news, advertisements and announcements shown on LCD televisions in front.

In-town check in used to be offered for a greater variety of airlines at both Hong Kong and Kowloon stations, but this has been partially suspended since the COVID-19 pandemic travel disruptions.

The Airport Express Shuttle Bus is a free service provided exclusively for Airport Express passengers at Hong Kong or Kowloon stations, connecting them with major hotels in the Western District though Quarry Bay on Hong Kong Island and the Yau Tsim Mong District and Hung Hom station in Kowloon.

The Airport Express Shuttle Bus was discontinued from 30 June 2020 due to low ridership caused by the COVID-19 pandemic.

[11] The Airport Express visual identity, which includes the logo, vehicle livery, signage, route maps and passenger information, was created in 1999 by Lloyd Northover, the British design consultancy founded by John Lloyd and Jim Northover.

Given their separate fare structure, Airport Express journeys require an out-of-system transfer if coming from or going to other MTR lines that call at the same or connected stations (e.g. coming from Central towards Hong Kong station or transferring between Airport Express and Tung Chung line trains).

[21] The Airport Express, along with other MTR metro lines, is monitored by the Operations Control Centre in Tsing Yi.

[22] The Airport Express is served by 11 CAF-Stock trains built and assembled by Construcciones y Auxiliar de Ferrocarriles in Spain while Adtranz contributed control and traction equipment.

[24] The interior was updated yet again in 2020, and new seat covers featuring the blue and aquamarine AEL logos and a grey wave pattern will be paired with synthetic leather head rests.

List In late 1998, Leon Lai showed a music video of MTR's Airport Express line for the song "Happy 2000", which includes the interior of the A-Train.