While the airline industry has expanded air travel tenfold and lowered costs for consumers over the past 40 years, shareholders have not earned returns to compensate them for the risk, with airlines averaging a net profit of only 0.1% of revenues. A small number of airlines have consistently earned returns exceeding their cost of capital through different business models and regions, but most airlines struggle with poor profitability due to issues with industry structure, government intervention, and strategy choices. Addressing these root causes is needed to improve returns to a sustainable level that can support further productivity and value for consumers.