By Lisa Barrington

(Reuters) -As Typhoon Ragasa, the world’s most powerful tropical cyclone this year, approached Hong Kong this week, mass flight cancellations and lost revenue were not the only headache for airlines based at one of the world’s busiest airports.

Ahead of the arrival of hurricane-force winds and torrential rain on Wednesday, about 80% of the aircraft belonging to the four main airlines based in the city had been relocated to or grounded at airports in Japan, China, Cambodia, Europe, Australia and other locations, Flightradar24 tracking data showed.

All landings and departures at Hong Kong, the world’s busiest cargo airport and the ninth busiest for international passenger traffic, were cancelled for 36 hours starting on Tuesday evening.

Hong Kong’s largest airline, Cat

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