What to KnowU.S. airlines began canceling hundreds of flights due to the FAA’s order to reduce air traffic at the country’s busiest airports because of the government shutdown.At LAX, travelers who spoke with NBCLA reported few problems early Friday morning, but said they were concerned about their return flights. The FAA’s gradual flight reductions start with a 4% cut Friday followed by 6% Nov. 11, 8% Nov. 13 and 10% Nov. 14.Federal authorities warned earlier this week that flight delays or cancellations were possible as the U.S.

Fourteen-year-old Cash Bullock expressed what many travelers were likely feeling as they arrived on a foggy Friday morning clouded in uncertainty at Los Angeles International Airport.

“I hope everything goes smoothly because I wouldn’t want to get stuck in New Jersey because that’s not like my hometown,” Cash said. “This is my hometown.”

Cash was flying with family to New Jersey on a 7 a.m. flight, but they arrived at LAX around 3 a.m. due to fears over cancellations and delays stemming from the government shutdown. The FAA said it was gradually decrease flight capacity at 40 major airports, including LAX and Ontario International Airport, starting on Friday.

The gradual reductions start with a 4% cut Friday followed by 6% Nov. 11, 8% Nov. 13 and 10% Nov. 14.

Cash and his mom were planning to catch their flight back home on Sunday.

“So far, this morning, everything’s looking good,” said Devra Bullock. “I’m just worried about the flight coming back out of New Jersey to LAX because it sounds like a lot of the flights are going to be canceled and delayed. Hoping for the best.”

Hundreds of flights were canceled Friday morning from coast-to-coast, according to flight tracking service FlightAware.com, including more than 50 cancellations.

Other early morning travelers who spoke with NBCLA said their flights were on time. Gianna Fartangelo, who was flying home to Rochester, NY, said her main concerns were for the federal government employees affected by the longest shutdown in U.S. history.

“I kept checking like the TikToks and all the social media, and I think it made it seem a lot worse than it actually is,” Farangelo said. “It seems fine, so far. I was checking over and over, and it kept saying, “On Time.” I think I’m lucky because I’m going from a hub city to another hub city, which United said they weren’t going to cancel… from hub to hub.

“I feel so bad for the TSA workers and the air traffic control.”

Federal authorities warned earlier this week that flight delays or cancellations were possible as the U.S. Department of Transportation imposes a 10% cutback on flight capacities at 40 major airports nationally. The shutdown led to staffing issues among air-traffic controllers, who are considered essential workers instructed to continue working, despite the closure and not receiving paychecks.

U.S. Transportation Secretary Sean Duffy announced Wednesday the reductions in capacity at 40 high-volume airports. NBC News obtained a list of impacted airports where the flight cuts would be made, which the FAA was expected to officially announce on Thursday.

Five California airports are on the list, including LAX, Ontario International Airport, San Diego International Airport, Oakland International Airport and San Francisco International Airport.

Los Angeles International Airport is among the top five busiest airfields in the nation.

Airlines have been issuing alerts to passengers to be aware of possible flight impacts.

United Airlines posted a message on its website stating, “We’re making updates to our schedule and will let you know if your flight is affected as soon as possible, but anyone flying between Nov. 6 and 13 can request a refund or reschedule for free.”

Southwest Airlines posted a notice saying the vast majority of its customers will not be affected, but said anyone with flights booked through Wednesday can adjust their travel plans at no cost, “or receive a refund if they choose not to travel, regardless of whether their flight is affected.”

Delta Air Lines also advised customers of flight reductions, and provided guidance for travelers about how they can change or cancel their flights without any financial penalties.

Frontier Airlines stated that it expects most of its flights to operate as planned, but it will communicate with passengers whose travel plans may be impacted by the cuts.

Here are some tips for air travelers.

Other airports that will lose flights

Below, the list of airports impacted by the FAA’s decision.

ANC – Anchorage International in Alaska

ATL – Hartsfield–Jackson Atlanta International in Georgia

BOS – Boston Logan International in Massachusetts

BWI – Baltimore/Washington International in Maryland

CLT – Charlotte Douglas International in North Carolina

CVG – Cincinnati/Northern Kentucky International in Ohio

DAL – Dallas Love Field in Texas

DCA – Ronald Reagan Washington National in Virginia

DEN – Denver International in Colorado

DFW – Dallas/Fort Worth International in Texas

DTW – Detroit Metropolitan Wayne County in Michigan

EWR – Newark Liberty International in New Jersey

FLL – Fort Lauderdale–Hollywood International in Florida

HNL – Honolulu International in Hawaii

HOU – William P. Hobby (Houston Hobby) in Texas

IAD – Washington Dulles International in Virginia

IAH – George Bush Houston Intercontinental in Texas

IND – Indianapolis International in Idiana

JFK – John F. Kennedy International in New York

LAS – Harry Reid International in Las Vegas

LAX – Los Angeles International in California

LGA – LaGuardia Airport in New York

MCO – Orlando International in Florida

MDW – Chicago Midway International in Illinois

MEM – Memphis International in Tennessee

MIA – Miami International in Florida

MSP – Minneapolis–St. Paul International in Minnesota

OAK – Oakland International in California

ONT – Ontario International in California

ORD – Chicago O’Hare International in Illinois

PDX – Portland International in Oregon

PHL – Philadelphia International in Pennsylvania

PHX – Phoenix Sky Harbor International in Arizona

SAN – San Diego International in California

SDF – Louisville International in Kentucky

SEA – Seattle–Tacoma International in Washington

SFO – San Francisco International in California

SLC – Salt Lake City International in Utah

TEB – Teterboro in New Jersey

TPA – Tampa International in Florida

“United’s long-haul international flying and our hub-to-hub flying will not be impacted by this schedule reduction direction from the FAA. That’s important to maintain the integrity of our network, give impacted customers as many options as possible to resume their trip, and sustain our crew pairing systems,” wrote Scott Kirby, United Airlines CEO. “Instead, we will focus our schedule reductions on regional flying and domestic mainline flights that do not travel between our hubs.”