Search teams have retrieved the cockpit voice and flight data recorders from the EgyptAir plane which crashed into the Mediterranean in May, killing all 66 on board.
It is hoped analysis of the black boxes will shed light on why the plane crashed en route from Paris to Alexandria.
At present no militant group has claimed responsibility for bringing down the aircraft.
The first audio available from EgyptAir Flight 804 indicates that all was routine as the plane checked in with air traffic controllers in Switzerland.
One of the pilots on board the flight that went missing on Thursday morning can be heard telling traffic control "Good day, er, good night".
The audio, taken from www.liveatc.net, a website that provides live air traffic control broadcasts from around the world, shows the pilots talking to traffic control in Zurich before being handed over to Italian air traffic controllers in Padova.
The communication occurred around midnight local time, about two-and-a-half hours before Greek air traffic controllers in Athens lost contact with EgyptAir flight.
Work has begun on analysing data from the two black boxes from the fated EgyptAir flight that crashed into the sea in May.
French air accident investigators confirm the signal detected earlier is from a flight recorder.
The head of Egypt's forensics authority said it is 'too early' to know what caused the EgyptAir plane to crash into the Mediterranean sea.