Which device do flight attendants use to communicate with the flight deck during an in-flight emergency?

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During an in-flight emergency, flight attendants need a fast, private line to the flight deck to relay information and receive instructions without involving passengers. The interphone system provides that direct two-way communication between cabin and cockpit, designed for urgent calls and typically with a push-to-talk or call button to ensure priority when every second counts. The public address system is meant for passenger announcements and isn’t suitable for coordinating with the cockpit. A cell phone isn’t used due to safety rules and interference concerns, and an emergency beacon is for distress signaling to search and rescue, not for routine cabin-to-cockpit communication. So, the interphone system is the appropriate device.