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Route A21 is a Hong Kong bus route operated by Citybus, with the Cityflyer brand. The route runs between Airport (Ground Transportation Centre) and Hung Hom Station. Its route towards Hung Hom Station connects Cheung Sha Wan, Mong Kok, Yau Ma Tei, Jordan, and Tsim Sha Tsui and for the return journey towards Airport connects Tsim Sha Tsui, Jordan, Yau Ma Tei, Mong Kok, Tai Kok Tsui and Nam Cheong The route mainly serves passengers in Kowloon (Central) and hotels along Nathan Road.

History

 * 6 July 1998: Commencement of Route A21 together with the opening of Hong Kong International Airport.
 * 16 July 2007: Bus towards airport re-routing to Nam Cheong and Hoi Lai Estate
 * 5 December 2007: Stop establishment at Airport (Terminal 2) for Airport bound.
 * 19 December 2012: Cityflyer Real-time Next Bus Arrival Time service available on all Cityflyer routes for passengers to search the estimated time of arrival of the routes.

Fare
Full fare: $39.0 This route provides Pre-paid Return Ticket: $55.0 (adult)/ $28.0 (child/senior), which is applicable to a two-way journey on either Route A21 or A22 with 3-month validity from date of issue.
 * from Lautau Link Toll Plaza to Airport (GTC): $17.0
 * from Airport (Terminal 1) to Airport (GTC): $4.0
 * from Lautau Link Toll Plaza to Sham Mong Road (AquaMarine): $26.0
 * from AquaMarine to Hung Hom Station: $8.0

Route & bus stops

 * Single-way journey is 78 minutes.