9. XB-70 Valkyrie
Price: $750,000,000
Highest Speed: 2,000mph
Time To Go Around the Earth: 12.43 hours
This jet had six engines and was built for a hypothetic nuclear strike. This was a prototype that was built in the year 1950 and was in service during the year 1964 to 1969 and was never really used as a serving jet.
