U.S. airline stocks are set to have their strongest monthly performance since 2021, fueled by lower fuel prices and strong travel demand. Despite inflation and signs of a slowing economy, travel spending has rebounded and the number of Americans traveling by air during the Fourth of July holiday is expected to surpass previous records. The outlook for the summer months is optimistic, with a projected 1% increase in passengers compared to 2019. However, analysts expect air travel demand to moderate in the second half due to uncertainty and limited visibility.