United Airlines is investigating how the baggage handler was trapped in the cargo hold of the jet on New Year's Day.
The man was found unharmed after United Airlines Flight 6060 landed at Dulles on Sunday, according to a statement from United.
The airline said the flight was operated by Mesa Airlines but offered no other details, CNN reported.
"It surprises me how a person's co-workers could let that happen when they're supposed to be checking up on each other," said Paul Thompson, a longtime ramp agent at Denver International Airport, commenting in general about baggage handling operations.
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Typically, a three-person crew works together to load the baggage compartment, he said. Depending on how long the compartment is, one or two workers go inside to pack luggage at the same time.
Baggage handling is a tough job, he said, which can often leave workers exhausted.
"We crawl in there, and we're working on our knees, just stacking the bags as nicely and neatly and efficiently as possible," Thompson said. "Sometimes there's a lot of downtime, especially during cold or bad weather."
Being trapped inside a baggage compartment during a flight is no picnic. The hold is pressurised. There is plenty of oxygen, but some airline cargo holds are not climate- controlled, Thompson said.
Radio traffic revealed that workers initially treated the incident as a possible security issue, CNN affiliate WBTV-TV in Charlotte reported.
"We're going to work it as a security incident until we can get some confirmation to who he is even though he's in trade dress for a ramper in Charlotte. The flight crew doesn't remember seeing him or anything like that," WBTV quoted radio traffic.