The Federal Aviation Administration has implemented some restrictions around its airspace ... were in the area. Some of the crews executed go-arounds as a result of the alerts.

NORAD pilots at Homestead Air Force Base are prepared to intercept general aviation pilots who violate restricted airspace, especially when President Trump is in Florida.

In general, airspace is mixed-use by default. Certain restrictions apply to military corridors and takeoff and landing paths around major airports, but broadly, the skies above the U.S. are open. But ...

TCAS works independently of ground air traffic control, searching nearby airspace using radio frequencies ... “as a result of the alerts.” The Federal Aviation Administration is investigating ...