New Delhi: Hong Kong has banned Air India flights from Delhi till December 3 after a few passengers on its flight earlier this week tested positive for COVID-19 post-arrival, a senior government official said on Friday.This is the fifth time Air India's flights from India have been banned by the Hong Kong government for bringing passengers who tested positive for the viral infection after arrival.The previous bans on the airline's Delhi-Hong Kong flights were from August 18 to August 31, September 20 to October 3 and October 17 to October 30, and on its Mumbai-Hong Kong flights during October 28-November 10.Passengers from India can arrive in Hong Kong only if they have a COVID-19 negative certificate from a test done within 72 hours prior.