301-10.121—What classes of airline accommodations are available?
Airlines are constantly updating their offerings. However, for the purposes of this regulation, the classes of available air accommodations are identified and defined as follows:
(a) Coach-class.
The basic class of accommodation by airlines that is normally the lowest fare offered regardless of airline terminology used. For reference purposes only, coach-class may also be referred to by airlines as “tourist class,” “economy class,” or as “single class” when the airline offers only one class of accommodations to all travelers.
(b) Other than coach-class.
Any class of accommodations above coach-class, e.g., first-class or business-class.
(1) First-class.
The highest class of accommodation offered by the airlines in terms of cost and amenities. This is generally termed “first-class” by airlines and reservation systems.
(2) Business-class.
A class of accommodation offered by airlines that is higher than coach and lower than first-class, in both cost and amenities. This class of accommodation is generally referred to as “business, business elite, business first, world business, connoisseur, or envoy” depending on the airline.