Biggest Planes: Past, Present, and Future Science, Technology As technology improves, things get faster, stronger, and bigger. This is especially true for military aircraft. Let’s looks at the biggest, baddest, and most powerful of the bunch. Kalinin K-7 Length: 91 ft 10 in You’ve never heard of the Kalinin K-7? That’s probably because only 1 was built, and that was destroyed in a crash. The K-7 first flew on August 11, 1933 but showed instability and massive vibration issues to the airframe.