The discoveries were made on the Normandy coast on Monday.
The plane, carrying the new Cardiff City striker and pilot David Ibbotson, disappeared on 21 January during a flight from Nantes to the Welsh capital.
The Air Accidents Investigation Branch has said that it has now identified a priority search area of four square nautical miles and they hope to start searching at the weekend.
In a statement, the AAIB said: ‘Since we opened our safety investigation on Tuesday 23 January, we have been gathering evidence such as flight, aircraft and personnel records, and have been analysing radar data and air traffic tapes. We have been working closely with other international authorities and have kept the families of those involved updated on our progress.
‘On the morning of Monday 28 January, we were advised by the Bureau d’Enquêtes & d’Analyses (BEA), the French safety investigation authority, that part of a seat cushion had been found on a beach near Surtainville on the Cotentin Peninsula. A second cushion was found in the same area later that day. From a preliminary examination we have concluded that it is likely that the cushions are from the missing aircraft.
‘From the moment we were notified of the missing aircraft, we have been looking at the feasibility of conducting an underwater seabed search for aircraft wreckage. Based on a detailed assessment of the flight path and last known radar position, we have now identified a priority search area of approximately four square nautical miles. Through the Ministry of Defence’s Salvage and Marine Operations (SALMO) Project Team, we have commissioned a specialist survey vessel to carry out an underwater survey of the seabed to try to locate and identify possible aircraft wreckage.’
