ATLANTA — Authorities are investigating after a passenger traveling through the Atlanta airport managed to get a gun past airport security and aboard a 14-hour Delta Airlines flight, just hours into the new year. 

Delta confirmed it happened on an Atlanta-to-Tokyo flight on Jan. 2.

According to online flight tracking website, Flight Aware, Delta flight 295 took off from Hartsfield-Jackson International Airport in Atlanta around 11:30 a.m. Jan. 2 and landed at Tokyo Narita International Airport around 3 p.m. Jan 3.

After landing, the passenger told officials about having the gun. Airline officials alerted TSA soon after, Delta said. The Atlanta-based airline declined further statement, deferring to the TSA. 

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11Alive reached out to the agency, who sent back a statement saying it "determined standard procedures were not followed," which allowed the passenger to pass through a standard screening checkpoint at Hartsfield-Jackson with the weapon.

"TSA will hold those responsible appropriately accountable," the agency said.

The agency later confirmed with NBC News that two TSA officers had been terminated as a result of the incident. 

It is not the first headline in which the agency has missed dangerous weapons in passengers' luggage. According to a 2017 NBC News report, TSA screeners failed to detect test weapons at a "high rate," findings one Congressional committee chairman called "disturbing." Before that, a 2015 investigation also found screeners failed to detect 95 percent of test items.

RELATED: TSA officers discover record-breaking number of guns at Atlanta airport

The news of the incident comes in the midst of the longest government shutdown in U.S. history, caused by political division over a proposed wall at the U.S. border with Mexico. 

RELATED: Shutdown day 23: Trump says he has 'no idea' if deal can be made with Pelosi

Nearly 800,000 "non-essential" federal employees - including those from the TSA - have been forced to work without pay as Congress and the President attempt to negotiate a plan to reopen the government.

RELATED: Congress approves back pay for federal workers once shutdown ends

RELATED: TSA agents protest government shutdown at Hartsfield-Jackson

In other news reports, TSA pointed out that the incident happened less than two weeks after the Dec. 22 start of the shutdown, and that perceptions the firearm being missed as a result were "false." 

TSA told 11Alive that staffing was not an issue when the gun made its way through TSA screening and onto that 14 hour flight from Atlanta to Tokyo on January 2nd. 

"The national call out percentages were exactly the same for Wed, 1/2/19 and Wed, 1/3/18 (when there was no shutdown) -- 5 %. It’s still accurate that staffing was not an issue in this case."