The US domestic air cargo market today is about as big as it was in early 2017 – despite a boom in e-commerce. After growing at about 3.7% per year between 2012 and 2021, flown traffic has dropped by almost 20% since early 2022. The bad news is that we may see more declines in the next 18 months. The good news is that declines are likely to be more moderate. This article looks at the outlook for the US air cargo market and discusses what it means for the demand for air capacity.