tom418 wrote:
Years ago, Piper ran an ad showing two piano movers loading a spinet piano
into a Cherokee Six . A double bass should be no problem

In "Flying Down to Rio" (1933)

http://makeashorterlink.com/?I52A24F0D

aviator and band leader Roger Bond (Gene Raymond) has a piano permanently
installed in the back of his single engine plane. Don't know what type it was,
but not a Cherokee.

They also do some other rather improbable things with airplanes, like IIRC a
double chorus line on the two wings of a biplane, doing the Rockette thing while
in flight. Lots of fun.