Flight attendants and supporters protest at O’Hare International Airport in Chicago, Tuesday, Feb. 13, 2024. (AP Photo / Nam Y. Huh)

The unions are calling Tuesday’s protests a national day of action. It is not a strike — federal law makes it difficult for airline unions to conduct legal strikes.

A proposed rendering of a new terminal at O’Hare International Airport. (Credit: Studio Gang / Chicago Department of Aviation)

Originally budgeted at $8.5 billion, the expansion is now reaching $12 billion. The most extensive part of the project is the 2.2 million-square-foot O’Hare Global Terminal, replacing what is now Terminal 2.

A United Airlines plane is pushed from the gate at George Bush Intercontinental Airport, Aug. 11, 2023, in Houston. (David J. Phillip / AP Photo)

United said the airline will add a filter to the booking tool on its website to help consumers find flights on which the plane can more easily accommodate their wheelchairs. The cargo doors on some planes are too small to easily get a motorized wheelchair in the belly of the plane.

A United Airlines jetliner lifts off from Denver International Airport, June 10, 2020, in Denver. United Airlines said Wednesday, May 3, 2023, that it hired 7,000 new workers in the first four months of this year and plans to hit 15,000 new hires by year end, matching the number it hired last year. (AP Photo / David Zalubowski, File)

United said 3,800 of its new jobs this year will be in Chicago, where the company is headquartered and runs a big operation at O’Hare International Airport. 

(Courtesy Archer Aviation)

United Airlines is partnering with Archer Aviation to offer flyers an air taxi service from Vertiport Chicago on the Near West Side to Chicago O’Hare International Airport.

A United Airlines jetliner taxis for take off from Denver International Airport, Thursday, May 26, 2022, in Denver.  (AP Photo/David Zalubowski, File)

United said Wednesday that it will resume seasonal flights from Newark, New Jersey, to Stockholm, which it dropped in 2019, and launch new summer service from Newark to Malaga, Spain.

(Raimond Spekking / Wikimedia Commons)

United Airlines says its unvaccinated pilots are costing the company millions. Crain’s Chicago Business reporter Stephanie Goldberg has details on that story and more.

Travelers well up as agents confer at the United Airlines ticketing counter in Denver International Airport Friday, July 2, 2021, in Denver. (AP Photo / David Zalubowski, File)

United Airlines reported a $473 million profit for the third quarter thanks to more than $1 billion in federal pandemic aid that helped pay airline employees this summer.

In this July 2, 2021 file photo, a United Airlines jetliner taxis down a runway for take off from Denver International Airport in Denver. (AP Photo / David Zalubowski, file)

United Airlines will require employees in the U.S. to be vaccinated against COVID-19 by late October, perhaps sooner, joining a growing number of big corporations that are responding to a surge in virus cases.

File-This Nov. 18, 2020, file photo shows a Boeing 737 Max 9 built for United Airlines landing at King County International Airport - Boeing Field after a test flight from Moses Lake, Wash., in Seattle. (AP Photo / Ted S. Warren, File)

United said Tuesday that it will buy 200 Boeing Max jets and 70 planes from Europe’s Airbus so that it can replace many of its smallest planes and some of its oldest and have room to grow its fleet.

(Raimond Spekking / Wikimedia Commons)

Good news for employees as air travel rebounds. Crain’s Chicago Business editor Ann Dwyer takes us behind the headline of that story and more.

This photo provided by Boom Supersonic shows an artist’s rendition of United Airlines Boom Supersonic Overture jet. (Boom Supersonic via AP)

United Airlines aims to bring back supersonic travel before the decade is over with a plane that has yet to be built.

(WTTW News)

The Chicago-based airline is encouraging frequent fliers to get vaccinated. Crain’s Chicago Business editor Ann Dwyer takes us behind the headline of that story and more.

(WTTW News)

The number of daily flights from the Chicago-based airline is set to take off. Crain’s Chicago Business editor Ann Dwyer takes us behind the headline of that story and more.

In this file photo taken from video, the engine of United Airlines Flight 328 is on fire after experiencing "a right-engine failure" shortly after takeoff from Denver International Airport, Saturday, Feb. 20, 2021, in Denver, Colo. Two passengers who were on board the United Airlines airplane that had to make an emergency landing are suing the company in separate suits filed Friday, April 16 in Chicago, where United is based. (Chad Schnell via AP, File)

Two passengers who were aboard a United Airlines flight that had to make an emergency landing after one of its engines blew apart and sent debris raining down on Colorado neighborhoods sued the company Friday.

United said Tuesday, April 6, 2021, it is now taking applications for the academy in Arizona, including from people who have no flying experience. (AP Photo / Jeff Chiu, File)

United Airlines says it will train 5,000 pilots this decade, including taking on applicants with no flying experience, and plans for half of them to be women or people of color.