It’s spring break season in the U.S. — and travelers are facing long airport lines as security screeners work without pay while the Department of Homeland security is shut down.

Congressional Democrats have declined to fund the agency in an attempt to force reforms of federal immigration enforcement practices.

Wait times at major hubs in Houston and Atlanta reached two hours on Friday, while New Orleans’s Louis Armstrong International Airport advised passengers to arrive at least three hours before their scheduled departures. In Philadelphia, airport officials closed three security checkpoints entirely this week because of short staffing.

On Saturday, President Trump threatened to send Immigration and Customs Enforcement agents to staff airport security lanes if Democrats don’t “immediately” agree to fund DHS. A bipartisan group of senators has been negotiating with the White House over immigration enforcement and ending the shutdown.

“I will move our brilliant and patriotic ICE Agents to the Airports where they will do Security like no one has ever seen before, including the immediate arrest of all Illegal Immigrants who have come into our Country,” Trump posted on Truth Social. In a follow-up post he said he told ICE to “GET READY” to deploy to airports on Monday.

Why are wait times so long?

Officials say wait times are unpredictable and can fluctuate sharply as airports struggle with Transportation Security Administration staffing shortages.

TSA staffers are considered essential workers, so about 50,000 have been working without pay due to the shutdown that started Feb. 14. Last week, they missed their first full paychecks. The Department of Homeland Security says more than 300 TSA officers have quit. More than half of TSA staff in Houston called out sick and nearly a third called out in Atlanta and New Orleans last week, DHS said.

The staffing shortage comes as travel has also been disrupted by severe weather, and as schools across the country close for spring break.

Some 2.8 million people were projected to travel on U.S. airlines each day in March and April, adding up to a record 171 million passengers, according to the industry group Airlines for America.

What do officials say?

Transportation officials are warning the situation could get worse if the shutdown isn’t resolved. A second missed paycheck would put even more strain on TSA workers, Transportation Secretary Sean Duffy told CNN on Friday.

“If a deal isn’t cut, you’re going to see what’s happening today look like child’s play,” Duffy said. “Is it still safe as you go through the airport? Yes, but it takes a lot longer because we have less agents working.” He added that some smaller airports may be forced to temporarily close if more staff calls out.

In the U.K., Foreign Office officials are also warning travelers of “travel disruption” caused by “longer than usual queues at some U.S. airports,” and recommended passengers check with their travel provider, airport, or airline for guidance.

On Saturday, billionaire Elon Musk weighed in with an offer to personally pay TSA staff.

“I would like to offer to pay the salaries of TSA personnel during this funding impasse that is negatively affecting the lives of so many Americans at airports throughout the country,” Musk posted on X early Saturday morning.

U.S. law generally bars government employees from receiving outside compensation for their work.

Even with disruptions, travel demand is still high

On top of long security wait times and weather impacts, travel is being affected by the war in Iran, which is driving up global oil prices.

On Friday, United Airlines said it would cut some flights over the next six months after jet fuel prices doubled in recent weeks. Capacity cuts are likely to send airfares even higher, even as ticket prices are already rising, said Clint Henderson, a spokesperson for the travel website The Points Guy.

Still, he said, none of that seems to be deterring Americans from flying.

“The appetite for travel is insatiable,” he said. “People seem willing to endure a lot of stuff to travel. And I don’t see any signs of that decreasing.”

How can travelers prepare?

Travel experts say it’s not just long wait times that travelers should prepare for — it’s the uncertainty.

“Every day this goes on, it’s getting worse and worse and worse,” Henderson said.

Here are some tips on how to prepare for upcoming air travel:

1. Know before you go
Many airport websites list estimated security wait times. That should be the first place you check to get a sense of how long lines might be, Henderson says. (TSA also estimates wait times on its website and app, but that’s not being regularly updated because of the shutdown, he added.)

“Knowledge is power,” Henderson said. “You should know what’s going on at your local airport.”

He noted there are 20 U.S. airports where security screening is done by private contractors, not the TSA — and they are not experiencing staffing shortages or long waits. Some are smaller regional airports, but the list also includes some larger hubs, including San Francisco International Airport and Kansas City International Airport.

“There’s big, big, big metropolitan areas where it’s not an issue at all,” Henderson said.

2. Budget extra time
If you’re someone who shows up at the airport when your flight starts boarding, think twice, says travel writer Chris Dong.

“I’m the type of traveler who usually arrives pretty last minute,” Dong said, “but I think that that advice would not be sound for the current situation.”

Even if wait times are listed as short, things can change on a dime. Dong recently flew out of John F. Kennedy Airport in New York and found the TSA PreCheck line unexpectedly closed.

“So then everyone that was funneled through the regular line, it was an extra like 20, 30 minutes,” he said. “I was sweating it out because I usually arrive super last-minute. And those levels of uncertainty are just higher now with the shutdown.”

3. Consider biometric screening
Henderson typically recommends signing up for TSA PreCheck or the Global Entry program to move through airport security more quickly — and to opt in to biometric screening. That has to be done in advance, and travelers also have to choose biometric screening in their airline apps.

“Make sure if that’s an option that you’re opted in for that, because that will save you so much agita,” he said.

For those who haven’t signed up in advance, there is a last-minute alternative: the private CLEAR program, which allows people to enroll at the airport. Henderson notes it’s pricey — annual membership costs $209 — but that some credit card companies will refund that fee.

“For me to skip a three-hour line is probably worth the membership fee, especially if you know your credit card will pay you back for it,” he said.

That said, expedited screening lanes are not always faster than regular screening, both Henderson and Dong warned. Always check what all the lanes look like when you arrive at the airport.

4. Make a plan B
If you miss a connection or your flight is canceled, be proactive about rebooking. “Have all the tools available to you in the toolbox in case things go wrong,” Henderson advises.

That includes installing your airline’s app on your smartphone and writing down their customer service number, so you aren’t scrambling to find it.

“And then, you know, obviously have a plan B,” Henderson said. “Know what other airlines fly the route that you want to take in case, you know, you missed your Delta flight and American is offering a flight you can take later that day.”

He says while airlines don’t generally like to rebook passengers on competitors’ flights, it’s worth asking. He also recommends having the information at hand to give to customer service agents, including flight number, airline and departure time.

And if an airline cancels your flight in the U.S., you’re entitled to a refund, according to the Department of Transportation.