What is the altitude interval above FL410 for eastbound flights?

For eastbound flights at altitudes above Flight Level (FL) 410, the altitude interval is established at 4,000 feet. This regulation is part of the standard vertical separation guidelines in place for high-altitude air traffic management to ensure safety and efficient use of airspace. The separation intervals are designed to minimize the risk of collision between aircraft while considering factors such as air traffic volume and the types of aircraft operating at those high altitudes.

At FL410 and above, the use of 4,000-foot intervals helps maintain adequate vertical separation between aircraft flying in opposite directions. Eastbound flights typically maintain odd altitudes (e.g., FL410, FL450) and will be separated by 4,000 feet from westbound flights, which would operate at even altitudes (e.g., FL420, FL440).

This altitude arrangement is crucial in managing high-altitude jet traffic, where aircraft tend to fly at more substantial distances apart vertically compared to lower altitudes. Thus, using 4,000-foot intervals effectively enhances safety and airspace efficiency at higher altitudes.