This document provides a summary of the US aviation industry from 2009. It discusses the history of the industry from the 1920s onwards and key events like the introduction of regulation in the 1930s and deregulation in the late 1970s. It also examines the effects of deregulation like increased competition, bankruptcies of major carriers, and the rise of low-cost carriers. The summary discusses the current state of the industry including consolidation through mergers, increasing fuel costs, and steps taken by airlines to cut costs and boost profits.