"After 30 years in service the Blackbird still looks like a 21st century aircraft. The SR-71's mission was strategic reconnaissance. One of the fastest planes ever built, it reached a top speed of more than 2,200 mph at an altitude of 80,000 feet. At this altitude, the crew needed to wear special pressurized suites and helmets and required 100% oxygen to survive. Because of its unique look and technological achievements, this aircraft is a favorite among aviation enthusiasts.