Flight cancellations by United Airlines are mounting at Houston’s airports as part of a federally mandated reduction in air traffic tied to the ongoing government shutdown.

The FAA will reduce air traffic at 40 airports following the staffing shortages among air traffic controllers.

According to the FAA, thousands of flights at "high-traffic" airports across the country will be cut or canceled starting Friday. The decision, the FAA and U.S. Transportation Secretary Sean Duffy said, was based on where air traffic controllers are feeling the most pressure.

Airlines are reducing flights starting Friday under a new FAA directive. Here’s how United, Southwest and American are handling it.

Travelers flying out of Houston's airports this weekend should prepare for possible delays due to the ongoing government shutdown, which has led the FAA to reduce air traffic by 10% in major markets,

Overall, United has canceled more than 100 flights each day, from Friday, Nov. 7 through Sunday, Nov. 9, the airline's website showed. Of those, 34 United flights scheduled to depart or arrive at Chicago O'Hare International Airport Friday were cut, with that number increasing to 38 Saturday.

Houston flight cancellations are starting, but there's something most passengers don't know about their rights.

U.S. airports in more than two dozen states, including both airports in Houston, are among those facing phased-in 10% reductions in air traffic beginning Friday due to the government shutdown.

Houston's George Bush Intercontinential Airport and William P. Hobby Airports are among the 40 that will see flights cut starting Friday due to the government shutdown. See the full list.

All flights at Reagan National Airport were halted for some time on Tuesday due to a bomb threat on a flight from Houston, federal authorities said.

United Airlines customers with flights booked to travel during the government shutdown will be eligible for a refund, CEO Scott Kirby told employees in a memo on Wednesday.