• Reagan Airport halted flights due to a security threat on a United plane on Tuesday. • ATC audio indicated an "unconfirmed bomb report" after the plane arrived from Houston. • This appears to be an apparent hoax, with the FBI telling BI that "no hazards were found."

An airport halted flights for about an hour on Tuesday — and it wasn't because of a staffing shortage.

A United Airlines aircraft at Ronald Reagan National Airport in Washington, DC, experienced a "security threat shortly" after arriving from Houston, a spokesperson for the Metropolitan Washington Airports Authority told Business Insider.

The airport issued a ground stop at around 11:30 a.m. — forcing departing planes to stay put and inbound flights to hold or divert — and the plane taxiied away from the terminal where

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