What does GMT commonly refer to in aviation?

In aviation, GMT refers to Greenwich Mean Time, which is a time system that serves as a reference point for time zones around the world. GMT is based on the mean solar time at the Prime Meridian in Greenwich, England, and it has been widely adopted in international aviation operations to standardize timekeeping across various geographic regions. This is particularly important for flight scheduling, coordination of international flights, and communications, as it allows for a uniform reference regardless of the local time in different locations.

Using GMT helps to eliminate confusion that can arise from varying local time zones, especially when coordinating flights that cross multiple time zones. It facilitates accurate planning and reduces the risk of scheduling conflicts, thereby enhancing the safety and efficiency of aviation operations.