HOUSTON (AP) — The Bush Intercontinental Airport in Houston is now seen as a key representation of the disruptions caused by a partial government shutdown affecting the U.S. air travel system.

Travelers express frustration as they face security wait times that have skyrocketed to four hours, significantly more than at other airports. Many Transportation Security Administration (TSA) employees are not reporting for duty due to the lack of pay amid the ongoing shutdown.

“And we’ve been in this airport since 8 o’clock in the morning. Very tired, queuing and queuing and very slow,” articulated Edgaer Fernando, who was heading to Guatemala.

Multiple factors contribute to the heightened problems at Bush Intercontinental, which include high callout rates for TSA workers, heavy passenger traffic as a major United Airlines hub, and a peak tourism month for Houston.

Surge in TSA Callouts at Houston Airports

Bush Intercontinental reported a staggering callout rate where nearly 40% of TSA employees did not show up for work on a recent Tuesday, while nearby Houston Hobby Airport had an even more alarming rate of 43%. Nationally, the average callout rate for TSA workers was only 11% on the same day.

We worry conditions will only get worse at airports across the U.S. until Congress ends this shutdown, noted Jim Szczesniak, director of aviation for the Houston Airport System, discussing the situation in a social media video.

The impacts are exacerbated by other major events in the city during March, including high-profile conferences and sports tournaments that add to the volume at the airport.

Mayor John Whitmire reassured that the recent delays, while frustrating, have not severely affected tourism—Houston restaurants and hotels showed a historic increase in visitors this March.

While wait times have slightly improved lately, with under two hours reported, travelers like Raj Chauhan, heading to Miami, emphasized the ongoing efforts by TSA members who are present and working hard under difficult conditions.

As the partial shutdown continues, the future of smooth operation at airports remains uncertain, as personnel costs and employee satisfaction become increasingly critical factors for the TSA workforce.