Four passengers of Abu Dhabi-Kochi flight (IX 4422) of Air India Express were on Friday detained at Thiruvananthapuram airport for allegedly trying to barge into the cockpit of the aircraft while protesting the delay in reaching their destination.The Chennai regional office of Director General of Civil Aviation (DGCA) has ordered an inquiry into the incident.There was a high drama at Thiruvananthapuram airport when one of the pilots of the flight, Capt Rupali Waghmare, pressed the hijack button in panic after some irate passengers allegedly stormed the cockpit.According to airport sources, the passengers on board the flight created ruckus as they got agitated after waiting for nearly four hours for an alternative arrangement by the airline to take them to Kochi as the flight had to be diverted to Thiruvananthapuram due to poor visibility at the original destination.After the problem came to the notice of airport authorities, it was initially reported that the matter had been resolved amicably and the flight was finally cleared for departure.However, it later emerged that four to six passengers were detained on their arrival in Kochi and taken to Nedumassery police station for interrogation for allegedly misbehaving with the pilots.Earlier, following the pilot's hijack alarm, CISF personnel and the local police surrounded the aircraft and forced around 200 passengers to vacate it. However, it later turned out that there was no hijack bid as such. An emergency security meeting was called at the airport to assess the situation.The airport officials said that it was an unscheduled stoppage at Thiruvananthapuram. They said the passengers got angry over the delay and tried to barge into the cockpit.Later, Air India said that the flight of its subsidiary, Air India Express, was diverted due to bad weather and the passengers behaved badly.The passengers, however, gave different versions, claiming that nobody from them had entered the cockpit and accused the airline of not making any arrangement for them despite waiting for several hours in Thiruvananthapuram.