Passenger apprehended over hoax hijack threat on Air India Kolkata-Mumbai flight; authorities isolate plane, deboarded passengers, flight delayed. The incident involved Air India flight AI 2772, an Airbus A320 (VT-TNH), which was scheduled to depart for Mumbai on Wednesday morning. The action was taken over Wednesday's incident involving Air India flight AI 2772, which was delayed for several hours after a handwritten threat note was found inside the aircraft's.