St. Louis Post-Dispatch, 13 February 1930, page 2C
Planes and equipment were displayed at the exposition. There was a stage show with music and a pageant. And a cow was milked in an airplane.
St. Louis Post-Dispatch, 19 February 1930, page 2A
On 18 February 1930, the Guernsey cow Elm Farm Ollie (also known as Nellie Jay and Sky Queen) was flown from Bismarck, Missouri to St. Louis, and was milked in the air. She produced 24 quarts of milk, which were put in paper cartons, attached to small parachutes, and dropped over the St. Louis Arena.
In 1930, my great-grandmother Kathleen (Graham) Boe worked as educational director for the Pevely Dairy in St. Louis. Perhaps she found this event interesting.