What are the vertical limits of the Federal Low Altitude airways, excluding Hawaii?

The vertical limits of the Federal Low Altitude Airways in the continental United States, excluding Hawaii, extend from 1,200 feet above ground level (AGL) up to, but not including, 18,000 feet mean sea level (MSL). This range is specifically designed to facilitate the safe and efficient movement of aircraft operating at lower altitudes while maintaining separation from higher altitude operations.

These low altitude airways serve as a structured path for aircraft, particularly useful for general aviation and regional operations, allowing pilots to navigate safely and effectively within controlled airspace. The 1,200 feet AGL threshold is significant because it is the altitude at which aircraft generally begin to experience the transitioning to higher air traffic control measures, while the upper limit of 18,000 feet MSL signifies the point where Air Traffic Control (ATC) takes on a more extensive role in managing aircraft at higher altitudes.

This set of vertical limits contrasts with other choices that either set the lower boundary too low or provide incorrect upper limits, hence reinforcing the correct understanding of Federal Low Altitude airways. Understanding these limits is crucial for pilots and air traffic professionals to ensure compliance with regulations and enhance safety in air traffic management.