At 31,285 cubic feet (876 cubic meters), the 747-400 has the largest passenger interior volume of any commercial airliner, which is equivalent to more than three houses each measuring 1,500 square feet (135 square meters). The 747-400 has a redesigned "flexible" cabin interior that allows airlines to rearrange seats and class configuration overnight (in eight hours). They also permit 48-hour conversion times for changes in galley and lavatory locations.