Baku, May 22, AZERTAC  The passengers of Baku-Moscow plane, that earlier returned to the departure airport due to technical problems, have been dispatched to Moscow in a reserve plane.Boeing 757 plane returned to the departure airport at 11:10 (UTC/GMT +5 hours), May 21, 2015, Azerbaijan Airlines CJSC (AZAL) said earlier.The plane carrying out the AHY-852 flight on Baku-Moscow route returned because of the pressure drop in one of its hydraulic systems, according to the company.The aircraft landed safely, without any casualties, according to the message from AZAL.The cause of the malfunction is being investigated by the special commission of Azerbaijan Airlines CJSC.