What is the correct method for a controller to correct errors on a flight progress strip?

Answer: C — Draw a single line through the error

The correct method for a controller to correct errors on a flight progress strip involves drawing a single line through the error. This method is standardized as it clearly indicates that the information is incorrect while preserving the original entry for reference. By crossing out the erroneous data, it minimizes confusion and maintains clarity on what was previously recorded. The practice ensures that other controllers reviewing the strip can easily recognize the mistake without losing track of the original information. Highlighting, circling, or erasing the error could lead to misunderstandings or the potential for mistakes in interpreting the data later on, which emphasizes the importance of using a consistent method that promotes clear communication among air traffic controllers.