In the Summer of 2025, United Airlines (UA) and Neste brought sustainable aviation fuel (SAF) to these three airports for the first time: Houston George Bush Intercontinental Airport (IAH) in Houston, Newark Liberty International Airport (EWR) in New Jersey, and Washington Dulles International Airport (IAD) in Washington, DC. The partnership represents the first time that any airline has operated to the three hubs, flying on SAF.