Omashu delivery system

The Omashu Delivery System Was a Mail and Package system in the City of Omashu, The System consisted of a series of Slides and chutes that the various packages went through to get to there destination. it was powered by Earthbending and gravity (Earthbending sent the packages up the slides, whilst gravity sent them down.)

A Younger king Bumi and Aang used the System as (what Bumi refered to as) "The World's Greatest Super Slide", by putting there selves in a box that was being sent down the slide. 100 years later, Aang took Katara and Sokka too Omashu, where he took them down the System, a slight accident on the chutes got them arrested. Finnaly, after 100 years, an elderly King Bumi and Aang took another ride.