Here Are Airports That Could Be Affected by the Air Traffic Slowdown

With less than 24 hours to go before the Federal Aviation Administration’s planned air traffic reductions are set to take effect, the Trump administration has not publicly shared a list of the 40 airports that will be affected, or told many of the airports bracing for cuts how flights may be canceled.

Government officials have already said the locations with the most air traffic would be the focus of the plans, and a preliminary list of airports that could be affected has circulated among airlines. Although not finalized, it shows the scope of the plans being discussed.

The cuts to flights will begin on Friday, when the affected airports are expected to see about a 4 percent reduction to their air traffic over the course of the day. Those cuts would deepen over the weekend until they reach the 10 percent level that Transportation Secretary Sean Duffy and F.A.A. Administrator Bryan Bedford announced on Wednesday.

The airports under discussion, according to government officials and airline industry executives familiar with the planning process, include those on the F.A.A.’s Core 30 list — a roster of the nation’s busiest airports for commercial traffic — as well as several high-traffic cargo hubs and airfields favored by private jets.

Other potential factors the government may consider include traffic, location and the strain on the local force of air traffic controllers — most were already pulling overtime shifts to make up for severe staffing shortages even before the shutdown, and now they are forced to work throughout it without pay.

As the list is finalized, here is look at 40 airports that could be affected.

The 30 highest-traffic airports in major metro areas

The F.A.A. has been steadily tracking controller absences at the busy hubs that make up its so-called Core 30 list, occasionally broadcasting that data — as they did on Halloween, when the agency noted that half were experiencing staffing triggers. Those airports are, listed by urban area:

• Hartsfield-Jackson Atlanta International Airport

• Boston Logan International Airport

• Baltimore-Washington International Airport

• Charlotte Douglas International Airport

• Ronald Reagan Washington National Airport

• Denver International Airport

• Dallas-Fort Worth International Airport

• Detroit Metropolitan Wayne County Airport

• Newark Liberty International Airport

• Fort Lauderdale- Hollywood International Airport

• Honolulu International Airport

• Washington Dulles International Airport

• George Bush Houston Intercontinental Airport

• New York John F. Kennedy International Airport

• Las Vegas McCarran International Airport

• Los Angeles International Airport

• New York LaGuardia Airport

• Orlando International Airport

• Chicago Midway Airport

• Memphis International Airport

• Miami International Airport

• Minneapolis-St. Paul International Airport

• Chicago O’Hare International Airport

• Philadelphia International Airport

• Phoenix Sky Harbor International Airport

• San Diego International Airport

• Seattle-Tacoma International Airport

• San Francisco International Airport

• Salt Lake City International Airport

• Tampa International Airport

Midsize commercial airports, cargo hubs and private jet fields

A smaller number of midsize airports that see significant commercial traffic, cargo hubs and airfields popular with private jet operators are also under discussion for cuts. Those include:

• Anchorage International Airport

• Cincinnati-Northern Kentucky International Airport

• Dallas Love Field

• Houston Hobby Airport

• Indianapolis International Airport

• Louisville International Airport

• Oakland International Airport

• Ontario International Airport in California

• Portland International Airport

• Teterboro Airport in New Jersey

Niraj Chokshi contributed reporting.