Merrill and Richman extensively modified the Vultee V-1A for the flight. Using Eastern Air Lines mechanics, Merrill had extra fuel tanks installed and a Wright Cyclone with a two-blade constant-speed prop fitted. The most modern equipment was sought out including the Hooven Radio Direction Finder (licensed to Bendix). It was Richman's idea to fill empty spaces in the wings and fuselage with 41,000 ping pong balls, which it was hoped would allow the aircraft to float if it was forced down in the ocean.