Abstract: An aircraft cabin system is provided in an aircraft for selectively locating interior units such as galleys and lavatories. The system includes floor fittings in the wall panels that secure the units to seat tracks that run the length of the fuselage. Some units are provided with tie-down bars that are secured to overhead frame fittings that are located throughout the aircraft. Electrical, water, and air utility services are provided through separate distribution lines that extend through the aircraft. The distribution lines are provided with spaced-apart couplings so that wherever an interior unit is located, it can be provided with services through adjacent couplings. Galley waste water is stored in a tank built into a food storage cart that is normaly attached to the galley. The lavatories are attached to a collection system that includes a set of modular and telescoping pipe sections which are assembled to length needed to connect the lavatories to a set of holding tanks.