- Man lifting a 100 horse-power aeroplane motor
- Looping the loop
- Lockheed P-38D&E
- Lockheed C60-A
- Lockheed C-40A
- Lockheed A-29&A
- Lilienthal's Experiments
- Lilienthal gliding
- Launching the Wright Glider
- Launching sea-planes from a ship’s deck
- Launching a sea-plane from a wire
- Langley’s Steam-driven Model
- Lady driving in a horse and cart
- LA Motordrome
- La France
- Illustration from U.S. patent 385087
- Hull of a Zeppelin during construction
- Henson's Proposed machine
- Henson and Stringfellow’s Model
- Grumman OA-9
- Group of French Aviators
- Grahame-White Military Biplane - side view
- Grahame-White Military Biplane - front view
- Grahame-White Military Biplane
- Flying Yankee Velocipede
- Fleeing Slaver
- First flight engine, 1903, cross section
- First flight engine, 1903, assembly
- First flight engine, 1903 rear view
- First flight engine, 1903
- First attempts
- Fighting Zeppelin raiders
- Fast mail-carrying aeroplanes will make postal deliveries everywhere
- Fairchild PT-19
- English one-wheeled Velocipede
- Early-type Airship
- Early type of Smack
- Duryea Automobile
- Dunne inherently stable Biplane
- Dropping off in parachute from flaming balloon
- Driving-seat of a touring plane
- Driving seat of Wright Biplane
- Driving on the road
- Drawing of 1885 Benz engine
- Drasina
- Douglas XB-19
- Douglas O-46A
- Douglas C-54A
- Douglas C-47
- Douglas C-39
- Douglas B-23
- Douglas B-18A
- Douglas B-18
- Douglas A-24
- Douglas A-20B & C
- Diagram comparing the Pioneer with the Columbia
- De Bacqueville
- D.F.W. (German-designed) Biplane
- Curtiss P-40E
- Curtiss C-46