What system allows communication among crew members within an aircraft?

The interphone system is a critical communication tool that allows crew members to communicate efficiently within the aircraft. It enables flight attendants and pilots to relay important information, coordinate responses during routine operations or emergencies, and maintain situational awareness throughout the flight. The interphone system is specifically designed for this purpose, ensuring that all crew members can stay connected regardless of their location within the cabin or cockpit.

Other systems mentioned, like cabin pressure, flight management, or navigation systems, serve entirely different functions related to the operation and safety of the flight. Cabin pressure systems manage the air pressure inside the aircraft to ensure passenger comfort and safety, while flight management and navigation systems assist pilots in planning and executing flight paths.