Top 10 Most Expensive Military Planes

C17A Globemaster III: $328 million
The Air Force military-transport plane is used to move troops into war zones, perform medical evacuations and conduct airdrop missions. There are 190 C17As in service; the aircraft is propelled by four turbofan engines (of the same type used on the twin-engine Boeing 757) and can drop 102 paratroopers at once. In operation since 1993, it has been used to deliver troops and humanitarian aid to Afghanistan and Iraq.

• The X-48B