Portland International Airport (PDX), the largest airport in the US state of Oregon, served 15 million passengers in 2013, overtaking its previous record of 14.7 million passengers in 2007.
Passenger traffic was driven by various factors such as improvements in the economy, a significant increase in December travel, and expanded route choices for passengers.
In December traffic increased 10% to 1.3 million passengers, making it the busiest December ever at the airport.
The growth in traffic can be attributed to Thanksgiving falling late in November, causing some holiday travelers to return home in December, as well as travel for football bowl games for both Oregon State University and the University of Oregon.
In 2013 travel was driven by nearly two dozen non-stop route improvements, offering travelers more ways to fly.
Air freight remained stable at 212,414t, representing a year-over-year increase of 0.3%.
Alaska Airlines launched several new daily or seasonal routes; Alaska seasonal flights were upgraded to daily for Bellingham, Washington; and flights to Kona in Hawaii were expanded to daily on a seasonal basis.
American Airlines improved the service with two new daily flights to Chicago; Delta Air Lines introduced four daily flights to Los Angeles; and United Airlines started a seasonal route to Cleveland.
In addition, flight frequencies increased on many PDX routes.
Authorities expect continued growth at the airport and a new passenger record as a result of more new routes on the way this year.
Portland International Airport is a joint civil-military airport located within city limits just south of the Columbia River in Multnomah County.