How many miles must aircraft be separated from obstructions?

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The correct answer is based on FAA regulations that specify the minimum distance aircraft must maintain from obstructions, such as buildings, antennas, and terrain. According to FAA guidelines, a separation of 5 miles is generally required to ensure safety and reduce the risk of collision or interference.

This minimum distance provides a buffer that accounts for both the aircraft's flight path and potential deviations that could occur due to wind or turbulence. It is crucial for maintaining safe operations, particularly in congested airspace where aircraft might be operating near various obstacles.

The other options reflect distances that are either too short or too long when compared to established regulations. The 3-mile separation would not provide adequate safety margin in many situations. The 10 and 15 miles options exceed the typical requirements, which are not necessary for ensuring the safe operation of aircraft under standard conditions.

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