In the latter half of 2016, the Port of Portland and several airlines at PDX approved a project intended to balance the use of the terminal and concourses at Portland International Airport. The subsequent project extended Concourse E by and added 6 new gates to the facility. After the project, Southwest Airlines relocated its operations from Concourse C to the newly expanded Concourse E, alongside United Airlines. With the relocation of Southwest Airlines to Concourse E, Alaska Airlines, American Airlines and JetBlue Airways became the primary users of Concourses B and C. Construction on this project began in the spring of 2017 and opened to passengers on July 15, 2020.