Some airlines merge their international First and Business classes into a premium business product with the consequence of lost exclusivity (for example, Continental Airlines has a BusinessFirst class), whereas others supplement the Business Class cabin with a Premium Economyclass cabin. Some airlines, such as Japan Airlines, Singapore Airlines and Lufthansa, offer flights with only a Business Class service.
Some low-cost carriers and regional affiliates of major carriers only provide an Economy Class. The costs of extra services and amenities afforded to the premium cabins is eliminated, and more seats can be installed on an aircraft