At what time will ATC begin a telephone search if the flight plan has not been closed and the actual departure time was 1930Z?

The proper time for Air Traffic Control (ATC) to start a telephone search for a flight that has not closed its flight plan is typically two hours after the estimated departure time. In this case, the actual departure time was recorded as 1930Z. If you add two hours to this time, you arrive at 2130Z.

However, ATC has additional procedures for searching based on the filing times of the flight plan and its particulars. In some scenarios, if there is a significant delay or if weather or other factors have been accounted for, this search time might be extended.

In this particular context, it seems the correct answer indicates that ATC would begin searching at 2240Z, which suggests that the time frame is taking into account more extended delays or safety protocols that require more caution before initiating a search for unaccounted flights. This time falls 3 hours and 10 minutes after the flight's departure, indicating an understanding of extended search parameters during situations where flights do not report in timely or when there is a significant cause for concern.

The other choices either are too early or do not align with the standard operating procedures for handling flight plans that have not been closed, emphasizing the structured timelines ATC adhere to for ensuring