a low-charge class of passenger accommodation in a ship, aircraft, etc.; also attributive; also adverbially, in the class of accommodation so…

The careful management of resources; sparingness. In air travel: = economy class n. at compounds 2.

the cheapest class of a service or product, esp. with reference to passenger air travel; frequently (hyphenated) attributive.

elliptical. = tourist class n. at compounds 2.

a class of fare between first class and tourist class on a passenger aircraft, etc., and designed esp. for the business traveller.

(in airline travel) a class offering inferior service and accommodations; spec. = economy class n. at economy, n. compounds 2.