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The primary function of HHDs (Handheld Devices) used by flight attendants is to facilitate various operational tasks that enhance service efficiency on board. One of their key roles is to collect payment for in-flight purchases. This includes processing transactions for food, beverages, and merchandise using secure payment methods directly from the device.

HHDs streamline the purchasing process, enabling flight attendants to handle transactions quickly and accurately, ensuring a smooth experience for passengers. This capability allows for immediate updates to inventory and sales tracking, which is essential for maintaining service standards and operational efficiency during flights.

Other options, although related to the services provided by flight attendants, do not encompass the primary function of HHDs in this context. Serving meals and providing entertainment options are typically managed through other systems and procedures, while checking passenger identification is more commonly associated with boarding processes rather than in-flight operations.