Airline Class of Service
Airlines traditionally have three travel classes, although many airlines are eliminating first class from international flight and now offer business as the highest level of service:
First Class, generally the most expensive and most comfortable accommodations available
Business Class, high quality, traditionally purchased by business travelers (sometimes called executive class)
Premium Economy, slightly better Economy Class seating (greater distance between rows of seats; the seats themselves may or may not be wider than regular economy class)
Economy Class (also known as coach class or travel class), basic
Accommodation, commonly purchases by leisure travelers