airliner
Word family
Synonym discussion
Sense: noun/1
'Airliner' is the most specific of these words, referring only to large passenger planes operated by airlines on scheduled routes. 'Aircraft' is the broadest term, covering everything from small single-engine Cessnas to military fighter jets and cargo planes — use it when you need a formal or technical catch-all. 'Passenger jet' overlaps with airliner but focuses on the engine type (jet vs. propeller); many regional airliners are now jets, so the terms are often interchangeable in everyday speech. 'Plane' is the most casual, everyday word for any fixed-wing aircraft. 'Commercial airplane' is a more technical synonym, common in the aviation industry. For example, 'the new double-deck airliner entered service last month' is natural, but 'the army sent three aircraft to deliver supplies' would sound odd with 'airliners' unless they were specifically passenger planes.
Etymology
The word 'airliner' was formed by combining 'air' (from Old English 'ǣr', meaning the invisible gas around us) with 'liner', a term that originally referred to a passenger ship belonging to a regular shipping line. The first recorded use of 'airliner' dates back to the early 20th century, when passenger aviation was just beginning. It was modelled on the earlier word 'ocean liner', drawing a parallel between large passenger ships that followed fixed routes and the new passenger planes doing the same thing in the sky.