What magnetic headings apply to aircraft flying above three thousand feet on an even heading?

When flying above three thousand feet on an even heading, aircraft are required to follow specific magnetic course rules as part of the FAA's established procedures for air traffic. These procedures help to maintain separation between aircraft in the National Airspace System.

The heading ranges are determined based on whether the aircraft is operating on an even or odd altitude, with even-numbered altitudes assigned to headings that fall within the range of 180 to 359 degrees. This means that when an aircraft is on a magnetic heading in this range and is flying at an even altitude (such as 4,000 or 6,000 feet), it is operating in accordance with the radar and air traffic control requirements designed to promote safety and efficient aircraft operations.

In contrast, other ranges such as 0 to 179 degrees would correspond to the even altitudes, while 90 to 270 degrees would be a mix that doesn't fit the criteria for even altitude operations. The range of 360 to 540 degrees exceeds the standard magnetic heading, further confirming that the correct choice focuses specifically on the 180 to 359 degrees to maintain standard traffic flow and safety in the airspace.