Geologist Richard Osman, who is originally from Swansea, has been named online by Welsh news agencies as the Briton who was on the plane that disappeared ten minutes after entering Egypt airspace this morning.
Mr Osman (41), is thought to have moved to Jersey to work for a gold mining company with offices in St Helier.
It is believed that there were 30 Egyptians, 15 French, two Iraqis, and one each from the UK, Belgium, Kuwait, Saudi Arabia, Sudan, Chad, Portugal, Algeria and Canada among the 66 passengers on board the flight which crashed .