Not all airspace is open. Whether for safety, secrecy, or national defense -- fly too close and you'll face serious trouble.

The airspace over Mar-a-Lago is governed by a combination of permanent and temporary flight restrictions. ... (TFR), extending the no-fly zone to a 30-nautical-mile radius for national security.

A fixed-wing civilian aircraft travelled into restricted air space above Kananaskis on Sunday, according to a news release ...