Secret Service of the Air (also known as Murder Plane) is a 1939 American adventure film directed by Noel M. Smith and starring Ronald Reagan. This film was the first in Warner Bros.' Secret Service series. The series consisted of four films, all starring Ronald Reagan as Lieutenant "Brass" Bancroft of the U.S. Secret Service and Eddie Foy, Jr. as his sidekick "Gabby." It was followed up by Code of the Secret Service, Smashing the Money Ring (both 1939), and Murder in the Air (1940), the last film in the series. Reagan was just starting out his film career and commented later that during that period, he was a B movie "Errol Flynn".