George Smith (89) died after a short spell in the Maison La Corderie residential home.
Mr Smith joined the Royal Air Force on his 20th birthday and trained as a mechanic air frame fitter.
After being posted to a number of stations, he was sent to Castle Archdale flying boat base on Lough Erne in Northern Ireland, where he kept the flying boats in working order for their fight against the U-boats.
At the end of the war he was posted to Aldergrove in Northern Ireland and on 6 January 1946 he returned to England, where he was demobbed.
Mr Smith moved to Jersey in 1957 and later began helping people to discover more about friends and relatives who had died in action. He researched the last movements of airmen who died in battle and set up a website to help people find out more about those who died.
Joe O’Loughlin, a friend of Mr Smith who lives in Belleek, Ireland, said: ‘All the information families had was the inadequate telegram stating that a father, son or brother was missing in action and presumed dead and offering sympathy.
As a result of the records researched and held by George, a large number of families learned the history of the final hours of the aircraft in which loved ones lost their lives.
‘His work brought closure and comfort to hundreds of people. And he was so modest about the work he had done for families who had lost loved ones in wartime aircraft crashes.’
Mr Smith, who died on 9 June, has one surviving sister who lives in the UK, to whom the JEP extends its sympathy.