Air Transportation Timeline

Leonardo da Vinci describes a flying machine 1492
	1783 Hot-air balloon
Parachute 1783
	1852 Dirigible
Zeppelin 1853
	1903 First airplane flight
Hydroplane 1911
	1926 Liquid-propelled rocket is invented.
First successful helicopter flight.1939
	1950s First working Hovercraft
Supersonic transport (SST) 1968
	1970 Jumbo jet
Solar-powered airplane 1981