In combat, many aircraft will operate at altitudes as low as 100 feet and at high airspeeds to defeat ground missile radars and avoid sophisticated surface-to-air missiles, anti-aircraft artillery, and enemy fighters.
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The military, in addition to following its own flying rules on low-level altitudes and airspeed, also follows those in Federal Aviation Regulation 91.79 which states that no plane may fly closer than 500 feet from any person, vessel, vehicle or structure.
Although uncommon, military flights can be approved during quiet hours based on mission requirements. WHY DO I SEE MILITARY AIRCRAFT FLYING AT NIGHT? 115th Fighter Wing pilots and crews are required to train at night to maintain readiness and all-weather capabilities.
Some business jets can soar up to 15,000 meters, while most military aircraft can fly at this altitude or even a little higher. However, these aircraft tend to stay below 15,000 feet for safety reasons, as the air can become too thin and make it impossible to burn aviation fuel continuously.
The likelihood of both thermal and mechanical turbulence is higher when flying low, increasing risks of loss of control and collision with terrain and obstacles.
LOW FLYING AIRCRAFT CANNOT BE DETECTED BY STANDARD RADAR BECAUSE OF INTERFERENCE FROM CLUTTER. LOW FLYING AIRCRAFT CANNOT BE DETECTED BY STANDARD RADAR BECAUSE OF INTERFERENCE FROM CLUTTER.
Most US military aircraft can exceed 50,000 feet, if they really really try. Again, the limits are classified. Most commercial jetliners cruise somewhere between 30,000 and 45,000 feet above mean sea level.
Planes have headlights so that pilots can see what is in front of them. Unfortunately, they are only effective during takeoffs and landings. Even with the slight illumination offered by the headlights, only darkness is visible when looking out the front window of a cockpit.