What does the one minute rule require after departure from the same or adjacent airports?

The one minute rule, as it pertains to aircraft departures from the same or adjacent airports, mandates that aircraft must have a course divergence of 45 degrees or more after takeoff. This rule is designed to enhance safety by ensuring that aircraft do not end up on trajectories that could lead to conflict or close encounters in the airspace shortly after departure.

Overcoming potential conflicts is crucial in busy airspace, particularly around airports where multiple aircraft may be taking off nearly simultaneously. The requirement to diverge by 45 degrees helps provide a buffer between aircraft, allowing for safer lateral separation as they climb to their respective cruising altitudes. This divergence also aids air traffic controllers in effectively managing separations and enhancing overall traffic flow.

The other answers, while they touch upon aspects of separation and altitude, do not accurately reflect the specific requirement of the one minute rule regarding course divergence. Understanding the specific degrees of divergence is critical for adhering to air traffic control regulations and ensuring safety in flight operations.