How airliners are classed

Airline types are identified in flight plans, manuals, and traffic displays by an ICAO type designator from Document 8643, not by a marketing name. B738 is a Boeing 737-800. A20N is an Airbus A320neo. B789 is a 787-9. The code is short on purpose: a dispatcher, a controller, and a type catalog can share it without arguing about paint or cabin product names.

IATA runs a parallel set of codes for scheduling and ticketing, so a 737-800 is also 738 on a ticket. IATA codes cover mostly airliners. The ICAO designator covers everything that flies under an instrument flight plan, and it is the better key for a type lexicon.

A narrowbody has one passenger aisle, roughly 130 to 200 seats, and works sectors from one to six hours. A widebody has two aisles and is built for long haul. Regional jets carry fifty to a hundred seats on thinner city pairs. Turboprop airliners trade jet speed for fuel economy on short sectors. The 12 August 2026 snapshot groups 86 airliner types this way: 31 narrowbody, 27 widebody, 17 regional jet, 11 turboprop airliner.

Class follows the airframe, not the paint. A P-8A Poseidon is a narrowbody because it is a 737 derivative. A KC-46A Pegasus and a 767-300F are widebodies because they are 767s. A Boeing Business Jet is a large business jet, not an airliner, because of how it is certificated and sold.

Large airliners are a duopoly. Boeing's line runs 737, 767, 777, and 787, with the 737 carrying the volume since 1967 across four generations: Original, Classic, Next Generation, and MAX. Airbus answers with the A320 family (A319, A320, A321, each in ceo and neo engine generations), the A330neo, and the A350. The 747 and A380 lines are closed; the four-engine era is over.

Below the duopoly, specialists own the thinner routes. Embraer's E-Jets and E2 generation define the regional jet class after Bombardier's CRJ line closed. ATR builds the ATR 42 and 72, and De Havilland Canada builds the Dash 8-400 (Q400) and the Twin Otter, a design so durable it returned to production decades after first flight.

In production means the factory line is open. It says nothing about what is on the ramp. The 737-800 is out of production and remains one of the most common types in US service. The 737 MAX 8 is the current-production Boeing narrowbody, and the MAX 10 is in certification in this snapshot.

Lines close slowly and types retire slowly. The 767 passenger line is effectively closed, yet the 767 is still built as a freighter and as the KC-46A tanker. Reading production status is reading the factory, not the sky.

A type is not a cabin layout, a payload chart, an airline's current fleet, or a livery. Those facts live in the type certificate, the AFM, the manufacturer characteristics manual, and the operator's own records. Aerolex covers the public identity: designator, family, maker, class, and published overall size.