Low in price; cheap, inexpensive.

(travel) an airline selling very cheap tickets but which does not provide (or charges for) typical services like meals or the carriage of baggage.

plural of low cost carrier

(aviation) A type of airline that tries to keep ticket prices as low as possible, by charging for everything, such as checked-in baggage, carry-on baggage, food, beverages, assigned seat numbers, etc.

plural of ultra low cost carrier