IndiGo, a private airline, on Sunday started the regular operation of its new flight in the Mumbai-Mangaluru-Mumbai sector on Sunday.The daily flight leaves Mumbai at 8.50 AM and reaches Mangaluru at 10.20 AM. Then, the flight leaves Mangaluru at 11 AM to reach Mumbai at 12.40 PM. IndiGo is using Airbus A320 for the new service, a release from the airline said.