Algiers - Air Algerie said it lost contact with one of its passenger aircraft nearly an hour after takeoff from Burkina Faso on Thursday bound for Algiers.
The source said contact with the flight was lost while it was still in Malian airspace approaching the border with Algeria.
"The plane was not far from the Algerian frontier when the crew was asked to make a detour because of poor visibility and to prevent the risk of collision with another aircraft on the Algiers-Bamako route," the source said.
"Contact was lost after the change of course." The airline announced that the plane had gone missing in a brief statement carried by national news agency APS.
"Air navigation services have lost contact with an Air Algerie plane Thursday flying from Ouagadougou to Algiers, 50 minutes after takeoff," the statement said.
It added that the company initiated an "emergency plan" in the search for flight AH5017, which flies the four-hour passenger route four times a week.
One of Algeria's worst air disasters occurred in February this year, when a C-130 military aircraft carrying 78 people crashed in the mountainous northeast, killing more than 70 people.
Tamanrasset in the deep south was the site of the country's worst ever civilian air disaster, in March 2003.
In that accident, all but one of 103 people on board were killed when an Air Algerie passenger plane crashed on takeoff after one of its engines caught fire. The sole survivor, a young Algerian soldier, was critically injured.