On departure Departing from Sofia , the aircraft was climbing Motion_directional to , but at it turned on Motion a heading Self_motion of 050 .

Another record also beaten in 2013 was Australia 's mean temperature climbing Cause_change_of_position_on_a_scale from set on 21 December 1972 to on 7 January 2013 .

The pilot had made Bringing a climbing Motion turn Motion into the clouds and inadvertently allowed Preventing_or_letting the aircraft to sideslip Change when he was still too close to the ground to avert Preventing_or_letting disaster .

Early in the flight , the aircraft , which was climbing Motion_directional to its assigned altitude on autopilot , quickly lost Earnings_and_losses cabin pressure and all six on board were incapacitated Destroying due to hypoxia—a lack of oxygen .

The aircraft continued climbing Motion_directional past its assigned altitude , then failed Confronting_problem to make the westward turn Change toward Dallas over north Florida and continued on its northwestern course , flying Motion over the southern and midwestern United States for almost four hours and .