These were replaced in August 2006 by nine Mercedes-Benz Citaros. These were the result of a Quality Bus Partnership between Arriva Shires & Essex, BAA and Hertfordshire County Council. These buses seat 39 and also have extra luggage racking.[8] Journey times were also improved.[9]
In March 2008, the route was diverted to serve the new Heathrow Terminal 5.[10] From 19 May, the service was withdrawn from Heathrow Terminal 4, with another new timetable introduced. Short workings on other parts of the route became routes 725 and 726.[11]
In July 2022, part of the batch of ADL Enviro200 MMCs were replaced by Wright Pulsar 2 bodied VDL SB200s transferred from Leicester in return for the Enviro200s.
From 24 July 2022, additional early morning, late evening and weekend journeys were introduced in conjunction with the Heathrow Airport Partnership.[13]
Current route
Route 724 operates via these primary locations:[14]
↑Wagstaff, J. S. (1976). The London single-deck bus of the fifties. Oakwood Press. p.10. ISBN978-0853611981. All the Country Area and Green Line routes were meanwhile being converted to one-man operation, passengers paying the driver as they boarded, the first Green Line one-man service being the 724. This was a new route introduced in July 1966, using one-man RF coaches from the outset. Running between Romford and High Wycombe as a limited-stop cross-country facility, it proved very successful in contrast to the earlier 727 experiment.
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