The e-commerce fuelled boom in US domestic air traffic appears to be over. This could have profound implications for the domestic air express business and the need for aircraft capacity in a market that is home to 43% of the world’s freighter fleet. Historically, there has been a strong correlation between growth in online shopping, overall economic growth and traffic moving through US domestic air express, e-commerce and general cargo networks. However, since late 2022 this relationship seems to have broken down – the market declined by 11% when the underlying fundamentals should have led to moderate growth in 2023 and acceleration in 2024.This article digs deeper into the data and provides an explanation as to what is happening.