From Reuters
Aviation experts said after re-enacting the doomed Boeing 737-300 flight from Larnaca in Cyprus to Prague, that the steward -- who had some flight training and used an emergency oxygen kit -- actually flew the plane for 10-12 minutes.
"We have indications that (he) controlled the plane. He took a portable oxygen device and opened the cockpit door using a code," Seraphim Kamoutsis, head of the Greek investigations team, told a news conference after the simulation.