The KOGALYMAVIA Airbus A-321 flight 9268 had just taken off from the Red Sea resort of Sharm el-Sheikh, destined for the Russian city of St Petersburg.
There were conflicting reports about the fate of the plane, some suggesting it had disappeared over Cyprus. Most of the passengers are thought to be Russian tourists.
The plane is operated by the Russian airline Kogalymavia. Latest reports say it is carrying 224 people including seven crew.
The Russian aviation authority Rosaviatsiya said in a statement that flight 9268 left Sharm el-Sheikh at 06:51 Moscow time (03:51 GMT) and was due into St Petersburg's Pulkovo airport at 12:10.
The authority added that the aircraft failed to make scheduled contact with Cyprus air traffic control 23 minutes after take-off and then disappeared from the radar.
Source BBC, CNN, ROSAVIATSIYA
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