Kolkata: With regular international flights stalled owing to the COVID-19 pandemic, Air India is set to operate direct flights between Kolkata and London, primarily for the purpose of repatriation, under the Centre’s Vande Bharat mission, a spokesperson for the airline said. The flights between NSC Bose International Airport here and Heathrow in London will operate twice a week from September 16 to October 24, he said here on Friday.