Boeing's B-17 Flying Fortress holds the record for the best-selling combat aircraft in history, with 12,731 units produced. This achievement was driven by World War II, where Boeing's engineering and production capabilities played a key role in supporting the Allied forces.
Lockheed Martin, while not surpassing Boeing's single-model production numbers, has several high-selling military aircraft models. The company is known for producing aircraft such as the P-38 Lightning, T-33 Shooting Star, C-130 Hercules, F-16 Fighting Falcon, and F-35 Lightning II.
The Lockheed Martin F-35 Lightning II has become one of the most successful military aircraft programs in recent years. Since its introduction in 2017, more than 1,230 units have been delivered to 20 nations, with over 3,400 on order. The program is notable for being the largest defense project by dollar value at over $400 billion in development and procurement costs. "Beyond the numbers, the F-35 is changing international defense relations and military aviation doctrine," according to statements about its impact on allied air forces and global defense partnerships.