As the condition of the male passenger continued to deteriorate in the flight AI-331 on Wednesday night, the pilots radioed the Kolkata air traffic control to report the onboard medical emergency.
Some time later, the pilots, Sarabjeet Singh and Pranay Misal, sought permission to make an unscheduled landing at the Kolkata airport and asked the air traffic control to keep medical teams on stand-by.
Acting on the request from the pilots, the Airports Authority of India rushed its doctors to the ATC tower, who interacted with them over the Very High Frequency (VHF) communication line to advise on the emergency treatment to help the passenger till the flight landed, they said.
The flight, carrying 244 passengers, made an emergency landing at Kolkata around 2200 hours and the sick passenger was rushed to a local hospital.
It later left for Mumbai shortly after midnight.