When should passengers don their oxygen masks if an emergency occurs in flight?

Passengers should don their oxygen masks immediately after the crew puts on their masks for several important reasons related to safety and emergency protocol. In the event of cabin depressurization or other situations requiring supplemental oxygen, the flight crew is specifically trained to manage these emergencies. The crew wearing their masks first serves as a clear signal to passengers that they should also take action to ensure their own safety.

This prompt action helps to maintain an effective chain of communication and reassurance, as passengers can observe the crew executing safety protocols. Furthermore, by donning their masks promptly after the crew, passengers can ensure they receive oxygen quickly, which is critical in potentially life-threatening situations involving changes in cabin pressure. The immediate response mitigates the risk of confusion or panic among passengers, contributing to overall safety during the emergency.