Hundreds of flights scheduled for Friday were cut at major U.S. airports as part of the Federal Aviation Administration’s effort to phase in 10% reductions because of the government shutdown.

The 40 airports are in what the FAA termed “high-volume markets” and include JFK, LaGuardia, and Newark. With the holiday season rapidly approaching, people are concerned about the state of air travel nationally.

Here’s a look at flight delay and cancellation data for the three major hubs. The information comes from FlightAware and is updated hourly.

See a list of airports affected by the shutdown, or a list sorted by average number of daily departures below.

List of airports affected by shutdown

Anchorage International (ANC)

Hartsfield-Jackson Atlanta International (ATL)

Boston Logan International (BOS)

Baltimore/Washington International (BWI)

Charlotte Douglas International (CLT)

Cincinnati/Northern Kentucky International (CVG)

Dallas Love (DAL)

Ronald Reagan Washington National (DCA)

Denver International (DEN)

Dallas/Fort Worth International (DFW)

Detroit Metropolitan Wayne County (DTW)

Newark Liberty International (EWR)

Fort Lauderdale/Hollywood International (FLL)

Honolulu International (HNL)

Houston Hobby (HOU)

Washington Dulles International (IAD)

George Bush Houston Intercontinental (IAH)

Indianapolis International (IND)

New York John F Kennedy International (JFK)

Las Vegas Harry Reid International (LAS)

Los Angeles International (LAX)

New York LaGuardia (LGA)

Orlando International (MCO)

Chicago Midway (MDW)

Memphis International (MEM)

Miami International (MIA)

Minneapolis/St Paul International (MSP)

Oakland International (OAK)

Ontario International (ONT)

Chicago O`Hare International (ORD)

Portland International (PDX)

Philadelphia International (PHL)

Phoenix Sky Harbor International (PHX)

San Diego International (SAN)

Louisville International (SDF)

Seattle/Tacoma International (SEA)

San Francisco International (SFO)

Salt Lake City International (SLC)

Teterboro (TEB)

Tampa International (TPA)