The Évian Conference was held in France in July 1938 by 32 countries, as an attempt to help the increased refugees from Germany, but aside from establishing the largely ineffectual Intergovernmental Committee on Refugees, little was accomplished and most countries participating did not increase the number of refugees they would accept.
On July 14, 1938, Hughes set another record by completing a flight around the world in just 91 hours (three days, 19 hours, 17 minutes), beating the previous record set in 1933 by Wiley Post in a single-engine Lockheed Vega by almost four days. Hughes returned home ahead of photographs of his flight. Taking off from New York City, Hughes continued to Paris, Moscow, Omsk, Yakutsk, Fairbanks, Minneapolis, then returning to New York City. For this flight, he flew a Lockheed 14 Super Electra (NX18973, a twin engine transport with a four-man crew) fitted with the latest radio and navigational equipment. Harry Connor was the co-pilot, Thomas Thurlow the navigator, Richard Stoddart the engineer, and Ed Lund the mechanic. Hughes wanted the flight to be a triumph of American aviation technology, illustrating that safe, long-distance air travel was possible. Albert Lodwick of Mystic, Iowa provided organizational skills as the flight operations manager. While he had previously been relatively obscure despite his wealth, being better known for dating Katharine Hepburn, New York City now gave Hughes a ticker-tape parade in the Canyon of Heroes.
His tasks for the Abwehr included collecting information on railways, military installations, and troop movements, as well as recruiting other spies within Czechoslovakia, in advance of a planned invasion of the country by Nazi Germany. He was arrested by the Czech government for espionage on 18 July 1938 and immediately imprisoned but was released as a political prisoner under the terms of the Munich Agreement, the instrument under which the Czech Sudetenland was annexed into Germany on 1 October.