There may have been more development of airships and travel by air in the form of gas filled balloons. The explosion was probably inevitable and may have been responsible for more deaths, even of a president back then. There could have been a new form of travel that evolved from the airships, who Knows?Perhaps less attention might have been given to airplanes and their development if the airship movement had been maintained for a longer period. We definitely became more interested in hydrogen and later developed the Hydrogen bomb. Hydrogen may still be a source of future travel in the further development of the gas when combined with other elements to produce new sources of transportation.New discoveries such as cold fusion, that has been a big hit in cheaper cost and power,as well as radiant energy and several others.