Southwest Airlines says it is ending cabin service earlier on flights, requiring passengers to do the usual pre-landing procedures such as ensuring their seatbelts are fastened and returning their seats to an upright position earlier than before. Beginning on Dec. 4, a company spokesperson said, flight attendants will start preparing the cabin for landing at an altitude of 18,000 feet (5,486 meters) instead of 10,000 feet (3,048 meters).