NEW DELHI: An Air India flight from San Francisco to Mumbai faced a technical issue with its left engine, leading to a delay and passenger deplaning at Kolkata’s Netaji Subhash Chandra Bose Airport.However, shortly after arriving at Kolkata airport at 12:45 am, the aircraft encountered a technical glitch in its left engine.Flight AI180 landed on time, but a snag in the left engine postponed its onward journey. Around 5:20am, an onboard announcement instructed all passengers to deplane.The aircraft’s captain informed passengers that the decision was taken in the interest of flight safety.