At the time of the opening of Hong Kong International Airport in 1998, the fleet consisted of 62 Dennis Trident 3 double decker buses (fleet numbers 2100-2161), of which 11 had Alexander ALX500 bodies and the other 51 had Duple Metsec DM5000 bodies.

All Cityflyer routes with the exception of A10, A17, A23 and NA10 have been cleared to use the 12.8 metre (42 ft) long buses.

On 28 November 2005, the Transport Department (TD) of Hong Kong invited tenders for new airport route plying between Hong Kong Southern District and Airport via Mount Davis Road and Kennedy Town.

On 23 January 2006, the Transport Department announced that Citybus had won the tender, with route number A10, the fare of which was set as HK$48, surpassing the A12 as the most expensive franchised bus route in Hong Kong.

[citation needed] In April 2016, the last of the MAN NL262s were retired, and their place filled by the 12 metre Enviro500 MMC double deckers.