On a passenger jetliner, first class usually refers to a limited number (rarely more than 10) of seats or cabins toward the front of the aircraft which have more space, comfort, service, and privacy. In general, first class is the highest class offered, although some airlines have either branded their new products as above first class or offering business class as the highest class. Propeller airliners often had first class in the rear, away from the noise of the engine and propeller, while first class on jet aircraft is normally positioned near the front of the aircraft, often in front of the business class section or on the upper deck of wide-body aircraft such as the Boeing 747 and Airbus A380.