Fastest flying boat

Fastest flying boat
Who
Martin XP6M-1 SeaMaster
What
1040 kilometre(s) per hour
When
01 January 1900
The Martin XP6M-1 SeaMaster, the US Navy four-jet-engined minelayer flown in 1955-9, was the fastest flying-boat ever built, with a top speed of 1,040 km/h (646 mph). In September 1948 the Martin JRM-2 Mars flying-boat set a payload record of 30,992 kg (68,327 lb).

Flying boats are aircraft with the ability to take off, land and float on water. Despite being at the cutting edge in the early days of flying, development of these aircraft slowed partly due to the range of land-based aircraft  improving and partly due to the development of aircraft carriers. Since the Second World War they have had little military or commercial significance.