3. Engines (Great from side or front view)
Boeing 737 (especially Classic/NG/MAX): Oval/elliptical nacelles with a distinctly flattened bottom (to fit lower ground clearance). MAX models have chevrons (sawtooth edges) on the exhaust.
Airbus A320 family: Perfectly round engine nacelles. Sits higher on longer landing gear.
Airbus A220: Round engines, but smaller overall aircraft with more slender wings/engines.
Engine comparison (Airbus round vs Boeing flattened):
How to differentiate between Boeing and Airbus aircraft - Grupo One Air
4. Overall Size & Proportions
A220: Smallest of the three (typically 100-150 seats). Shorter fuselage, distinctive high-wing appearance relative to size, and a more "tucked" look.
737 & A320: Similar size (A320 family slightly longer in some variants), but the 737 often looks a bit more "hunched" due to shorter landing gear.
Side views for overall comparison:
Boeing 737 (pointed nose, flattened engines visible):
Airbus A320 (rounded nose, round engines, higher stance):
Airbus A220 (compact, sleek, rounded features):
5. Other Helpful Cues
Wingtips: Airbus often has upward-curving "sharklets" (especially A320neo). Boeing uses blended/split scimitar winglets on many 737s.
Landing Gear: 737 sits lower (shorter gear). A320 sits taller.
Tail: 737 often has a dorsal fin (smooth extension from fuselage to vertical stabilizer). A320 tail is more abrupt.
At night: Look at wingtip strobe patterns or engine glow.
With practice, the nose cockpit windows combo lets you ID them quickly even at a distance. Apps like Flightradar24 help confirm, but spotting is more fun with these visual clues.
Next time I'll look at the internal wing structure, the centre of gravity and how fuel is cleverly controlled so it's storage system keeps the plane level, even if an engine goes out of action. It's fascinating stuff. Enjoy โ๏ธ