What speed restriction applies below 10,000 feet but above Class B airspace corridors?

When flying below 10,000 feet in areas outside of Class B airspace corridors, a speed restriction of 250 knots applies. This regulation is put in place to ensure safety and manage air traffic effectively in busy airspace, as lower altitudes typically experience higher volumes of aircraft. The 250-knot limit helps to minimize the likelihood of wake turbulence and allows for better handling of various aircraft types as they operate in more congested environments.

In comparison, speeds above this threshold are generally allowed in less congested airspace or at higher altitudes where the risk of conflict due to high speeds is lower. The choice of 250 knots aligns with the regulations set forth by the FAA, which prioritize safety and operational efficiency in the national airspace system.