Air India has instituted an inquiry into the incident and the ground staff involved have been derostered, the airline's spokesperson GP Rao said.
There were no injuries sustained in the accident, according to Air India.
The incident happened around 11 am when Shanghai-bound AI 348 was parked at IGI. An electronic tow truck carrying luggage of passengers rammed into one of the engines of the Boeing 787 aircraft.
The flight was scheduled for takeoff at 11.40 am and the airline's spoksperson said the boarding for the flight had not started by then.
He added that an alternative aircraft was arranged for the flight, which took off from here after a delay of 45 minutes with nearly 210 passengers.