What does the 'RLS' abbreviation signify when writing a release time on a strip?

The abbreviation 'RLS' signifies the 'Release time statement' on a strip. In air traffic control, the release time statement is critically important as it communicates the point in time when an aircraft is authorized to proceed, whether it’s for takeoff or when leaving a holding pattern. This clarity helps controllers ensure a smooth flow of air traffic and allows pilots to manage their operations accordingly. Understanding this concept is essential for maintaining safety and efficiency in airspace management, as it establishes clear expectations for both pilots and air traffic controllers.

The other options may touch on aspects of air traffic operations, but they do not specifically encapsulate what 'RLS' stands for. While holding instructions and flight plans are relevant to the broader context of air traffic control, they do not align with the specific meaning of 'RLS' as it relates to release time on a strip. Therefore, 'Release time statement' is the correct interpretation of the abbreviation.