Although the SR-71 is an incredible plane, its time has passed. True that no other aircraft flys high enough or fast enough to pose a credible threat, and there are only a few SAMs that can actually reach that high. Compared to existing satellite technology, however, and the SR-71 begins to pale in comparison. It requires a relatively healthy contingent of support personnell and equipment for each mission, and it's high resolution cameras are not designed for real time target acquisition. US spy satellites have the ability to monitor a specific area for up to 90 minutes continuously, before it passes out of range. This is something the SR-71 simply cannot do. The Blackbird was designed to fly high, fast and unimpeded by enemy air defenses, take very good quality pictures, and return to base where they would be developed and then analyzed. In todays world, the time spent to actually begin to analyze the data captured by the Blackbird is a liability. Still a technological wonder of an aircraft, and I doubt there will ever be another one like it. Did you know that the Blackbird will leak fuel constantly while on the ground, and does not actually seal up until it reaches cruising speed, which heats up the skin of the wings and sealing the fuel tanks.