Airliners, or 1(passenger) planes, differ from light planes not only in 2(size) but also in speed and equipment. They are designed to 3(carry) a greater number of people over longer 4(distances) without stopping to refuel. A passenger airliner has a comfortable 5(cabin) with soft carpets, adjustable upholstered 6(seats), washrooms, and individual 7(air vents) and reading lights. It has a 8(galley) for preparing food. Many airlines offer 9(tourist), or economy class service, which costs less than first-class travel. The 10(cruising speed) of four-engine airliners range from about 350 mph for propeller-driven planes to more than 500 mph for 11(jet-propelled) planes. The 12(crew) of an airliner works as a team to make the trip smooth and pleasant. While the passengers take their seats, the pilot or 13(captain), co-pilot, flight engineer, and stewardesses prepare the plane for 14(flight). The pilot, assisted by the 15(co-pilot), checks the instruments and tests the controls. The 16(flight engineer) checks the other mechanical equipment. The stewardesses check the 17(passenger list), make sure that the passengers fasten their 18(safety belts) for 19take-off . Later, the 20(stewardesses) distribute magazines, serve meals, and do other things to make the 21(trip) enjoyable.