S56 is quite detoured from Tung Chung to the airport, but it's not the case from airport to Tung Chung. Passengers boarding this bus include Cathay Pacific crew. Later, these 657x-658x buses are used on route W1 from Jordan (West Kowloon Station) to Admiralty (West).
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<span class="int-own-work" lang="en">Own work</span>