The man — a ticketed passenger, according to American Airlines — was seen running past the gate agent and onto the jet bridge before eventually making his way onto the aircraft, according to travelers who witnessed the scene on Monday morning.
“I was on a flight to NYC (American Airlines 1060 to EWR) and a guy ran into the plane screaming that it was his plane and he's FBI,” passenger Ari Teman wrote on Facebook. “The crew called for security, who had to take him off.”
Teman added that he believed the man may have been faking his outburst, as he seemed “lucid and controlled” throughout the incident.
Another passenger inside the cabin also shared video to Instagram, showing passengers blocking the man from further entering the cabin. The passenger who shared the footage also claimed it took 10 minutes for airport security to come remove the man.
American Airlines confirmed that airport police did eventually remove the man from the plane.
"During the boarding process of American Airlines flight 1060 from Miami to Newark, a ticketed passenger for that flight ran on the jetbridge, bypassing the gate agent,” the airline shared in a statement to Fox News. “Law enforcement was summoned, who removed the passenger."
All passengers inside the plane were then told to disembark to allow a sweep of the aircraft, another airline representative confirmed.
“The plane was subsequently searched for damage and contraband, firearms, explosives, et cetera, and the plane was searched and all clear,” American Airlines spokeswoman Alexis Aran Coello told the Washington Post.
Footage taken from back at the gate, filmed by Teman, shows officers restraining the man in front of travelers inside the terminal.
The man was detained and brought to the Jackson Memorial Hospital for a mental evaluation, CBS4 reports.
A representative for the Miami-Dade police confirmed the man was detained and admitted to the Jackson Memorial Hospital for a mental evaluation, as he was determined to be "in crisis" when officers arrived.
"The plane was checked by MDPD K-9 officers, which yielded negative results. No one else was injured during the incident," police said in a statement to Fox News.
Monday’s incident comes just days after a woman managed to board a Delta Air Lines flight at the Orlando airport without any boarding pass or ID. She was later removed by police.