(AP Photo/Susan Walsh)
FBI spokesman Andrew Ames said no hazards were found aboard the plane that landed about 1 p.m. at the airport just outside Washington, D.C.
Airport police took the person who made the threat to a mental health facility in Dayton, where the person was expected to stay overnight, said Special Agent Michael Brooks, an FBI spokesman in Cincinnati. He did not identify the suspect.
No charges had been filed as of Sunday evening and there are no other suspects, Brooks said.
"We have no reason to believe anyone else was involved," he said.
The threat shut down the airport for about 20 minutes. US Airways Flight 2596 was moved away from the gate after landing, the FBI said. Reagan airport was the flight's original destination.
Airport operations were back to normal, although some US Airways flights were delayed because the affected flight was taken to an area used by the airline, Metropolitan Washington Airports Authority spokeswoman Courtney Mickalonis.
The plane was close to Reagan National at the time the threat was received, so officials allowed it to keep going, Ames said.