What percentage of water/waste capacity does the FAP indicate for domestic flights?

The FAP indicates that for domestic flights, the water/waste capacity is set at 50%. This figure is derived from operational protocols designed to maximize efficiency while ensuring adequate resources are available for onboard services. By allocating 50% of the total water/waste capacity for domestic flights, aircraft can provide the necessary amenities for passengers without overestimating the requirements, thus balancing fuel efficiency and operational weight. This helps airlines effectively manage their resources based on the expected passenger load and flight duration, ensuring that the aircraft is not unnecessarily burdened while still being adequately prepared for passenger needs.