The captain was on a scheduled break when the aircraft, traveling from Mumbai to Brussels, took a sharp dip. Turkish air traffic controllers alerted the co-pilot that they were flying at an altitude assigned to another plane. The co-captain, who was checking flight information on her iPad, then woke the pilot who took control.
The two pilots were suspended and summoned for questioning by the Directorate General of Civil Aviation (DGCA), India's air regulation service. Jet Airways said it is launching a full inquiry into the matter.
"The airline is also extending all co-operation in the matter to the DGCA by providing all necessary assistance for the inquiry," a Jet Airways spokesman told NDTV.
There were 280 passengers on board.