Flying Buzz saw, Air Wonder Stories, 1930
picture from Yesterday's Tomorrows, pg. 117
Flying Hot Dog Stand, don't know the origin,
picture from Yesterday's Tomorrows, back cover
From Ripley's Believe It or Not, 10/31/99, copyright 1999 Ripley Entertainment
Inc.
While this is a modern innovation couldn't you see swarms of air pirates
using something similar to board a zeppelin (though probably not in pink
tights)?
The Air Raiders, c. 1930, Frederick C. Yohn (1875-1933)
from Out of Time: Designs for the Twentieth Century Future,
Norman Brosterman,
Harry N. Abrams, Inc., Publishers, 2000, pg. 67.