What is the time frame that defines an aircraft on a VFR flight plan as overdue?

An aircraft on a VFR (Visual Flight Rules) flight plan is considered overdue if it does not report in within 30 minutes of its anticipated arrival time. This timeframe is established to ensure that timely searches can be initiated for aircraft that may have encountered difficulties or diverted from their expected path. The 30-minute guideline allows air traffic control and personnel to respond promptly, balancing the need for a quick reaction with the understanding that pilots flying under VFR may occasionally experience delays due to weather, unforeseen circumstances, or changes in their flight plans.

Contextually, the other timeframes are not standard for defining overdue status. Ten minutes is typically too short to allow for minor delays that might occur during flight. Sixty and ninety minutes extend beyond what is typical for VFR operations, as the focus on maintaining situational awareness and safety is paramount in aviation practices. Hence, the 30-minute rule strikes an appropriate balance for ensuring prompt action without being overly restrictive.