Upper-deck hump
The second deck occupies only the forward fuselage and ends before the wing.
Four-engine widebody identification
The 747’s short upper deck creates aviation’s best-known silhouette. On the -400, confirm the variant using the tall winglets at each wingtip.

Recognition checklist
The second deck occupies only the forward fuselage and ends before the wing.
Two engines hang beneath each swept wing.
The 747-400 usually carries upright winglets; the later 747-8 uses raked tips instead.
At a glance
Published headline figures vary by configuration and operating conditions.
Make it stick
Use the visual clues in a focused image quiz with immediate explanations.