As Italian military aviation struggled to get back on its feet in the wake of World War Two, an unlikely fleet of Savoia-Marchetti SM82s in the markings of the Order of St John managed to fly on

Visitors to the Italian Air Force Museum at Vigna di Valle, north of Rome, might be forgiven for wondering at a strange roundel on the fuselage of one of the exhibits. It’s a white eightpointed cross on a red background, an emblem that in fact goes back at least 900 years, originating in mediaeval Jerusalem. As such, it’s arguably by far the oldest aviation insignia in the world.