Officials at Denver International Airport said Friday would be one of the worst crowded days at the airport, and her prediction was correct – TSA security lines were overwhelmed most of the day.

Sometime in the afternoon, the subway trains from the Jeppesen terminal to the waiting halls stopped operating. This forced officials to temporarily close security checkpoints. The trains returned at 4 p.m

Due to the high volume of passengers, the airport closed its Pikes Peak Shuttle Lot to newly arriving vehicles. Drivers seeking shuttle parking are now directed to the Landside Parking Lot at 6961 Valley Head Street.

The Transportation Security Administration expects more than a million people to be screened by Jan. 2.

There is also expected to be a lot of activity at the airport on December 26th, 27th and 29th. Another day that is expected to be one of the busiest is December 30th.

A impending possible government shutdown The measure is not expected to have an immediate impact on national airport operations. The airport released a statement about this possibility:

DEN is on track to serve 82 million passengers this year and relies on the strength and capacity of its federal agency partners to provide safe and efficient operations and a quality experience for travelers. Even a partial government shutdown puts at risk thousands of employees such as Transportation Security Administration (TSA) officers (TSOs), Customs and Border Protection (CBP) officers, and Federal Aviation Administration (FAA) air traffic controllers, all of whom are classified as essential employees and are required to continue working without pay until financial resources become available. Disruptions for a prolonged period could have a significant impact on passengers and would weaken morale, causing undue hardship and financial strain to families and dependents of workers. Previous closures have resulted in traveler frustration as passengers endured longer wait times and travel delays at many airports.