The Ilyushin Il-76
The Ilyushin II-76 measures 152 foot if you can believe it! In 1974, it was first developed to replace an Antonov aircraft. It can reach a speed of 559 miles an hour. It was the first four-jet heavy transporter from Russia. About a thousand of this model have been built, and many of them are still in use.
The Boeing C-17 Globemaster III
This is a huge one. The Boeing C-17 Globemaster III is one of the biggest military transport aircraft in existence. It was in production from 1991 until 2015. Every unit of this model costs a whopping $218 million. To be fair, we have no idea if that is a big or small amount when it comes to military spending.