Portland International Airport, also known as PDX, is Oregon's largest travel hub. From here, you can get to the Netherlands, Mexico, the U.K., Iceland, Canada, Germany, and many cities throughout the U.S. on direct flights. About 20 passenger airlines operate out of PDX, and the airport is a hub for Alaskan Airlines. The top domestic destination from Portland is Seattle, Washington, just north, and the top international destination is Guadalajara, Mexico.