There’s Music in the Air for Airplane Travelers (Apr, 1940)

There’s Music in the Air for Airplane Travelers
AS THEY fly to their destinations, passengers on planes of a major transcontinental air line can now listen to broadcast radio programs. Stations are tuned in on a master set and the programs are piped to individual loudspeakers housed in padded units that hang over the seat backs of those passengers who desire to listen in.