Editing Portland International Airport (section)

===Terminal expansion (2020s)===
[[File:Portland International Airport main terminal - trees and roof (2024).jpg|thumb|right|Interior of the main terminal after it reopened in August 2024]]

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 {{convert|750|ft}} 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.<ref>{{cite news| title=Airlines Approve Terminal Balancing Project and Concourse E Extension| url=http://cdn.portofportland.com/pdfs/PDXaminer_9_2016.pdf| page=3| work=Pdxaminer| publisher=Port of Portland| date=September 2016| access-date=September 4, 2016| archive-url=https://web.archive.org/web/20160916132751/http://cdn.portofportland.com/pdfs/PDXaminer_9_2016.pdf| archive-date=September 16, 2016| url-status=live}}</ref><ref name="Port of Portland - PDX Next">{{cite web |url=https://www.portofportland.com/PDXnext |website=PDXNext |access-date=July 30, 2019 |title=Port of Portland - PDX Next |archive-url=https://web.archive.org/web/20190731022224/https://www.portofportland.com/PDXnext |archive-date=July 31, 2019 |url-status=live }}</ref><ref>{{cite web |title=Portland airport hit with airline layoffs, hopes for revival of air travel |url=https://www.oregonlive.com/business/2020/07/portland-airport-hit-with-airline-layoffs-hopes-for-revival-of-air-travel.html |website=Oregonlive |date=July 10, 2020 |access-date=July 13, 2020 |archive-date=July 15, 2020 |archive-url=https://web.archive.org/web/20200715222847/https://www.oregonlive.com/business/2020/07/portland-airport-hit-with-airline-layoffs-hopes-for-revival-of-air-travel.html |url-status=live }}</ref>

Concourse A was demolished in November 2019 due to the age and space of the structure and was replaced by an expanded Concourse B. The extension featured 4 jet bridges, 6 ground loading zones, and improved concession stands. All Horizon operations that operated out of Concourse A was temporarily moved to Concourse C until the expanded Concourse B was completed. The new concourse opened on December 8, 2021.<ref>{{cite web |title=Portland in mourning over loss of 'classic' PDX airport carpet |url=https://komonews.com/news/local/portland-in-mourning-over-loss-of-classic-pdx-airport-carpet |website=Komo News |date=November 14, 2019 |access-date=November 14, 2019 |archive-date=November 14, 2019 |archive-url=https://web.archive.org/web/20191114224452/https://komonews.com/news/local/portland-in-mourning-over-loss-of-classic-pdx-airport-carpet |url-status=live }}</ref><ref name="Port of Portland - PDX Next"/><ref>{{cite web|title=TCORE - Concourse B Renovation Public Notice|date=January 23, 2019|url=https://popcdn.azureedge.net/pdfs/PDX%20CAC%20TCORE%20-%20CCB%20Notice%20of%20Proposed%20Development%20January%202019.pdf|access-date=October 1, 2019|archive-url=https://web.archive.org/web/20190709114128/https://popcdn.azureedge.net/pdfs/PDX%20CAC%20TCORE%20-%20CCB%20Notice%20of%20Proposed%20Development%20January%202019.pdf|archive-date=July 9, 2019|url-status=live}}{{cite web |title=Concourse B debuts at Portland International Airport |url=https://www.kgw.com/article/news/local/pdx-airport-concourse-b/283-de1991b1-5e52-496f-b93e-b88367f99fa5 |website=KGW8 |date=December 8, 2021 |access-date=December 8, 2021 |archive-date=December 8, 2021 |archive-url=https://web.archive.org/web/20211208005105/https://www.kgw.com/article/news/local/pdx-airport-concourse-b/283-de1991b1-5e52-496f-b93e-b88367f99fa5 |url-status=live }}</ref>

In March 2020, the main terminal began a five-year expansion process to generate more open space in the pre-security area and an expansion of 150 feet toward the west. The concourse connector was closed in January 2021 and the Clocktower Plaza closed three months later to make room for the expansion. During construction, the remains of the concourse connector was reused for passengers to bypass the construction zone to get to concourses C and D. Construction of phase one of the new main terminal was expected to be complete by May 2024.<ref>{{cite web |title=PDX construction 101: What's happening at your local airport, explained |url=https://www.pdxnext.com/Stories/Details/pdx-construction-guide |website=PDXNext |access-date=June 9, 2021}}</ref><ref>{{cite web |title=Photos of PDX's New Terminal Are Here, and It's Glorious |url=https://www.pdxmonthly.com/travel-and-outdoors/2023/08/pdx-airport-photos-renovated-main-terminal |website=PDX Monthly |access-date=August 23, 2023 |archive-date=August 24, 2023 |archive-url=https://web.archive.org/web/20230824005221/https://www.pdxmonthly.com/travel-and-outdoors/2023/08/pdx-airport-photos-renovated-main-terminal |url-status=live }}</ref> One month before its scheduled opening, however, the opening date for the new terminal was delayed by three months due to construction incidents on site.<ref>{{cite web |title=Portland International Airport sets main terminal opening date for August 2024 after delays |url=https://www.kgw.com/article/money/business/portland-international-airport-main-terminal-opening-date-august-2024/283-3fffec15-d236-499a-9647-2f70d0716da4 |website=KGW |date=April 4, 2024 |access-date=April 8, 2024}}</ref> Phase one of the new terminal opened to the public on August 14, 2024.<ref>{{cite web |title=New PDX main terminal opens, 'greets visitors the Oregon way' |url=https://www.koin.com/news/portland/pdx-airport-new-main-terminal-open/ |website=KOIN 6 |access-date=August 14, 2024 |archive-date=August 14, 2024 |archive-url=https://web.archive.org/web/20240814133037/https://www.koin.com/news/portland/pdx-airport-new-main-terminal-open/ |url-status=live }}</ref> As of September 2024, total construction is expected to wrap up in early 2026.

Alaska Airlines began shifting connecting flights from Seattle to Portland in May 2025 as part of a strategy to use the latter as a reliever for overcrowding at Seattle–Tacoma.<ref>{{cite news |last=Rosenblatt |first=Lauren |date=April 29, 2025 |title=Why Alaska Air wants Portland to be its Sea-Tac 'relief valve' |url=https://www.seattletimes.com/business/boeing-aerospace/why-alaska-air-wants-portland-to-be-its-sea-tac-relief-valve/ |work=The Seattle Times |accessdate=April 29, 2025}}</ref>