New Delhi, June 8 -- The Directorate General of Civil Aviation (DGCA), India's aviation watchdog, on Monday announced it has launched an inquiry into an incident in which three stationary Air India passenger jets sustained damage at Delhi's international airport after being struck by ground service equipment on Sunday.

The trio of aeroplanes has been taken out of service for safety checks and repairs, the DGCA said in an official statement.

Three Air India single-aisle jets stationed at Terminal 2 of Delhi's Indira Gandhi International Airport suffered structural harm when airport service gear rammed into them during a sudden bout of fierce gales and downpours, according to the airport operator.

"Three Air India A320 aircraft parked at...