Officials have recovered the black boxes following the deadliest airplane crash in Greece's history.

All 121 people on board were killed, a third of them children.

A pilot on the flight from Cyprus to Greece reported a problem with the air conditioning, then, nothing from the cockpit.

A passenger sent a horrifying text message to a relative... "One of the pilots has turned blue. My cousin and I bid you farewell, we are all frozen."

The Greek Air Force scrambled two fighter jets.

Pilots say they saw a member of the cockpit crew slumped over the controls.

Two other people appeared to be struggling to regain control of the jet.

Minutes later.. the aircraft slammed into a mountainside.

(David Learmount, Flight International:) "THE AIR IN THE FLIGHT DECK WAS GETTING THINNER AND THINNER. GRADUALLY PEOPLE WERE BEING DEPRIVED OF OXYGEN WITHOUT EVEN REALIZING IT WAS HAPPENING."

Rescue teams say bodies were frozen solid.

That suggests a pressure problem, resulting in a loss of oxygen.

The passengers may have been dead before the plane hit the ground.