Citybus Dennis Trident 12metres ( Airbus - Cityflyer ) In order to meet the demands of the passenger goes between the towns and the Chek Lap Kok Airport, CityBus had acquired 61 Dennis Trident with Deluxe Airport Version built. Those Airbus were purchased since the end of 1996. There were 11 with Alexander bodywork and the others 51 were fitted with Duple Metsec bodywork while one of them was being the prototype. For those fitted with Alexander ALX500 body ( #2101 - #2111 ), they were installed with Voith D863.3 automatic gearbox. With totally 108 passengers allowance ( U51 / L21 / S36 ). For those fitted with Duple Metsec body ( #2100, #2112 - #2161 ), they were installed with ZF 5HP500 automatic gearbox. Total passengers allowance for #2100 is 111 ( U53 / L25 / S33 ) while the allowance for #2112 to #2161 are 109 ( U53 / L25 / S31 ). All those Airbus are then named as "CityFlyer" and serving on Route A11, A12, A21 and A22.