An alert was sounded after a threat about bombs in five flights of Jet Airways on Tuesday. The threat was received after when three of the flights had already landed at their destinations.
Passengers were evacuated at Jolly Grant Airport in Dehradun after bomb scare in the Mumbai-Dehradun flight.
The Delhi to Chennai flight was taken in an isolated area at IGI Airport after the threat.
Security agencies are already on alert after the series of attacks in Belgian capital city Brussels.
While the Jet Airways flight to Chennai was grounded nearly 20 minutes before take-off, the other four Dehradun-Delhi, Chennai-Delhi, Chandigarh-Delhi and Gorakhpur-Delhi flights were already in air when the call came.
The call was made around 3.30 pm at the Jet Airways front desk in Chandigarh a few hours after the terror attacks at the Brussels airport and metro.
After the four planes landed, the crew members and passengers on board were deplaned and security agencies started a thorough search. Three of them landed at Delhi while the fourth was diverted to Nagpur.
The fifth Delhi-Chennai flight, which was supposed to take off at 4.05 pm has been stopped for security reasons. Final clearance for the flight was awaited till filing of the news report.
Sources said, the aircraft were taken to the isolation bay at the Indira Gandhi International Airport. Experts from the bomb disposal squad were also pressed.