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TFR, or Temporary Flight Restriction is a section of airspace that the FAA has restricted entry into. It is usually issued for airshows and presidential travel.

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Why do TFRs for spacecraft launches have ceilings?

Rockets must cross altitudes above this level to reach space and a collision with aviation traffic would be disastrous; so how is this risk mitigated if not by having pilots observe a TFR? … to cover the part of the spacecraft flight after it has left the area covered by a TFR but before it has left the area liable to contain other air traffic. …
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