When a flight is operating late, how long after the scheduled departure time must a new FSU be issued?

A new Flight Summary Update (FSU) must be issued for flights operating late within 1 to 30 minutes after the scheduled departure time to ensure that all operational data, such as passenger counts and cargo loads, is current and accurately reflects the flight's conditions. Issuing a new FSU during this window helps maintain safety and efficiency in flight operations, keeps flight crews informed, and ensures compliance with regulatory requirements.

In this timeframe, the operational environment may still allow for adjustments or last-minute changes, making timely updates essential. This practice helps manage passenger communications and operational logistics effectively.