Final answer:
During a delayed flight, announcements should be made to passengers at least every 30 minutes to keep them well-informed and manage their expectations effectively.
Step-by-step explanation:
When managing the expectations of passengers during a flight delay, it is important to keep them regularly updated. Communication should be frequent and informative. While specific policies may vary by airline, a good rule of thumb is to make delay announcements at least every 30 minutes. This helps maintain a good level of transparency and customer service, ensuring that passengers feel informed and are not left wondering about the status of their flight. Moreover, regular updates may help in reducing passenger frustration and maintaining a calm environment at the gate.