Soviet Union once built a plane so massive it could carry multiple tanks—The Antonov An-225.

A cargo plane designed around an impossible load

The An-225 began as part of the Soviet space program, not as a general-purpose record-breaker. It was built to carry the Buran space shuttle and components of the Energia rocket—loads too large to fit inside ordinary cargo aircraft. Carrying them on the outside would expose them to airflow and weather, so designers made the plane’s fuselage large enough to take cargo inside and gave its nose a hinged section that could swing upward for loading.

The result was an aircraft with six engines and a maximum payload of about 250 metric tons. Its scale created a practical advantage: outsized machinery could travel in one piece rather than being dismantled, shipped by other means, and assembled again. After the Buran program ended, the An-225 found work hauling unusual industrial cargo around the world.

The airport had to fit the aircraft, too

A plane this heavy puts enormous force through its landing gear, so the runway’s length was only part of the challenge. Pavement must be strong enough to withstand repeated landings and takeoffs; taxiways and parking areas also need room for a very large aircraft to turn and maneuver. Airports that handled the An-225 had to assess those limits and arrange suitable ground facilities, rather than treating it like an ordinary freighter.

That infrastructure helped make the aircraft useful, but also made its operation exceptional. The An-225 could connect places that needed a single, unusually large shipment moved by air—provided the departure and arrival airports could accommodate it.

A one-of-a-kind aircraft

The An-225 was the only completed example. It was destroyed in 2022 at Hostomel Airport in Ukraine, where it was based, during the Russian invasion. Its loss was not simply the loss of a record-setting airframe: it removed a specialized transport capability built around loads few other aircraft could carry in one piece. Its defining achievement was turning cargo too large for conventional aviation into something that could be loaded, flown, and delivered as a single unit.