About a century, actually: http://en.wikipedia.org/wiki/Airborne_leaflet_propaganda#Early_use http://en.wikipedia.org/wiki/Airborne_leaflet_propaganda#Ear...

About a century, actually: http://en.wikipedia.org/wiki/Airborne_leaflet_propaganda#Early_use http://en.wikipedia.org/wiki/Airborne_leaflet_propaganda#Ear... Aerial leaflets were first used on a large scale during World War I by all parties.