The airport land was originally a military rifle range. In 1918, the Royal Air Force began using the field behind the range for experimental mail flights, and the airport opened officially in 1920 as the "Ottawa Air Station", one of the six original airfields opened across Canada by the new Air Board. Since it is on the shore of the Ottawa river and the runways were connected to the riverfront by a road, it was one of very few airports capable of handling and transferring floatplanes on both land and water. On March 12, 1930, Canadian World War I flying ace William George Barker crashed into the Ottawa River and died during an aerial demonstration over the field. In July 1931, Charles Lindbergh and Anne Morrow Lindbergh visited the airport during their northern surveying tour. During World War II. Rockcliffe participated in the British Commonwealth Air Training Program and many other kinds of testing, training, and transport operations, including flying overseas mail to troops in Europe.