Air navigation services lost track of the Swiftair MD-83 around 50 minutes after take-offThe plane, which is operated by Air Algerie, was last picked up on radar at 1.55am GMT, the official Algerian news agency said. The flight should have landed in the Algerian capital at 5am GMT.The flight path of AH5017 from Ouagadougou, the capital of the west African nation of Burkina Faso, to Algiers was not immediately clear.A source from Air Algerie told the AFP news agency said contact was lost while it was still in Malian air space approaching the border with Algeria.The source said: 'The plane was not far from the Algerian frontier when the crew was asked to make a detour because of poor visibility and to prevent the risk of collision with another aircraft on the Algiers-Bamako route.'Contact was lost after the change of course.'The airline announced that the plane, which is owned by Spanish private airline Swiftair, had gone missing in a brief statement carried by national news agency APS.It added that the company initiated an 'emergency plan' in the search for flight AH5017, which flies the four-hour passenger route four times a week.Ougadougou is in a nearly straight line south of Algiers, passing over Mali where unrest continues in the north.Tamanrasset in the deep south was the site of the country's worst ever civilian air disaster, in March 2003.In that accident, all but one of 103 people on board were killed when an Air Algerie passenger plane crashed on takeoff after one of its engines caught fire.The sole survivor, a young Algerian soldier, was critically injured.The incident comes a week after Malaysia Airlines flight MH17 was shot down by a surface-to-air missile over Ukraine, killing all 298 people on board.Concerns were first raised about the plane when it disappeared from radar screens while passing over the city of Donetsk last Thursday.The plane was travelling at 33,000 feet on a pre-determined flight path when it suddenly vanished from trackers, immediately notifying air traffic controllers of the prospect that the plane had either crashed or made an emergency landing.Flight radars generally monitor moving objects only, so if an aircraft disappears from the screens it either means the plane has become stationary or there has been a fault with the tracking system.Tragically in the case of MH17 the former was true - but it wasn’t until body parts and plane wreckage were spotted scattered over an eight square-mile area in eastern Ukraine that a crash could be officially confirmed.In the case of the missing Malaysia Airlines flight MH370, the latter was the true, where it is believed the radar transponder system was deliberately turned off by someone on board.That plane is believed to have crashed in the Indian Ocean, killing all 239 people on board, but the wreckage has never been found and the cause of the disaster is unknown.(dailymail.co.uk)Bakudaily.az