ANKARA, Turkey — A jetliner carrying 56 passengers and crew was reported missing in central Turkey early today, shortly before it was scheduled to land, airline and Turkish authorities said.

Helicopters took off from Ankara, the capital, to search for the Atlasjet, which went missing after it reported approaching the airport near the city of Isparta.

Forty-nine passengers and seven crew members were aboard the plane, Tuncel Doganel, chief executive officer of the Atlasjet, said in a statement.

The MD 83 jetliner had taken off from Istanbul, Doganel said.