EgyptAir flight MS804 did not swerve and change direction before disappearing from radar screens, according to officials in Egypt.
Greece had previously suggested the plane had turned 90 degrees left and performed a 360 degree turn to the right before it crashed into the Mediterranean.
The Airbus A320 disappeared from radar screens on route from Paris to Cairo last Thursday.
All 66 people on board are believed to have been killed.
Now, despite earlier reports to the contrary, a senior Egyptian aviation official has said there was no unusual movement.
In an interview with the Associated Press, Ehab Azmy, head of the Egyptian state-run provider of air navigation services, said the plane had been flying at its normal height of 37,000 feet before dropping off the radar.
“That fact degrades what the Greeks are saying about the aircraft suddenly losing altitude before it vanished from radar,” Azmy said.
Debris from the plane has been located.
On Sunday, Egypt deployed a robot submarine to search for the flight data recorders of the missing EgyptAir plane.