New Delhi, September 2Chaos reigned at IGI Airport’s Terminal-3 on Friday after the Lufthansa airline cancelled two of its flights due to a pilots’ strike, stranding hundreds of passengers.More than 150 relatives of the stranded travellers gathered outside the airport and threatened to launch a violent protest. “Flights to Munich and Frankfurt which were to carry 400 passengers were cancelled without intimation,” Tanu Sharma, DCP, IGI Airport, said.