For what purpose is coordination between planners on either side of the ocean necessary?

Answer: B — To ensure efficiency and safety of ocean crossings

Coordination between planners on either side of the ocean is essential primarily to ensure the efficiency and safety of ocean crossings. This collaboration is necessary to manage air traffic effectively as aircraft transition between different airspace jurisdictions. Planners must communicate to assess and maintain safe distances between flights, manage altitude assignments, and respond to any operational changes that could impact aircraft navigating these extensive and often congested routes. Effective coordination aids in mitigating risks associated with ocean crossings, such as adverse weather or emergency situations, enabling a fluid flow of air traffic and enhancing overall safety. While establishing new flight routes, reducing overall flight duration, and facilitating international flights are relevant considerations within the realm of air traffic management, the fundamental priority remains on ensuring safety and efficiency—particularly critical over vast areas like oceans, where direct communication and real-time adjustments are more challenging.