One flight was returned to the gate and rescreened, while another was held after landing so authorities could inspect the baggage.
A US Airways spokesman says the Transportation Safety Administration asked that Flight 1716 from Philadelphia be parked remotely when it landed and the baggage inspected. Passengers were taken to a building away from the terminal during the inspection while luggage was unloaded and screened.
United Airways Flight 636 to Chicago was returned to the gate and passengers sent back through security screening at the request of the crew while the aircraft was swept. A United spokeswoman did not say why.
The TSA didn't immediately return calls seeking comment.
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