C-17 Globemaster III – $328 million
The C-17 Globemaster is a massive military transport plane that commands admiration wherever it goes. It costs $328 million to build and even more to operate. The C-17 Globemaster, on the other hand, has several advantages, including high reliability, maintainability, and reparability. As a result, despite being introduced in 1991, it is still used by many militaries worldwide. The four Pratt and Whitney F117-PW-100 turbofan engines produce 40,440lb of thrust, which is insane even today, and the 170,900lb payload capacity is still one of the best in the business.
P-8A Poseidon – $256.5 million
The P-8A Poseidon was originally intended solely as a surveillance plane. On the other hand, the US military had other ideas and wanted a plane that could carry heavy weapons like torpedoes, missiles, and mines. Of course, Boeing was more than happy to comply, at the cost of $256.5 million per unit and more than $33 billion for the entire project. The hydrocarbon sensor, which can detect fuel vapors from submarines and ships with diesel engines, is one of the most intriguing features.