That's a good answer. A data visualization would be something like a 2-d graph of altitude vs airspeed and in theory something could be made to fly over every

That's a good answer. A data visualization would be something like a 2-d graph of altitude vs airspeed and in theory something could be made to fly over every point on that plane, and NASA does aeronautical research over every point on that plane. Unfortunately real aircraft only safely fly inside weirdly shaped polygons on that graph. And the U-2 is a really pointy narrow little shape that crosses all the Y-axis altitudes but the speed is restricted such that its shape is practically a line both above and below the plane can't fly so no data or research is possible off that narrow line. If you merely want to get to 70 Kft then its awesome, if you want to take engineering data or science experiments at exactly 352 knots not 351 or 353 knots, and 70 Kft, then unless you're very lucky you're not flying a U2 on that research mission. That's the secret of the U2. Everyone knows back in the good old days it was developed and flown in months for no cost compared to the F-22. However the engineering criteria were staggeringly different and there's a big difference between "fly extremely high without crashing while carrying a camera" vs "outfly and outfight every tactical fighter aircraft and missile system on the entire planet, everywhere, under every circumstance" and the difference is about 19 years of development and about a trillion bucks. There is no management secret or space alien technology secret to the U2, its just a very restricted aircraft that barely flies under ideal conditions, but when it does, it can fly higher than any plane built up to when it was designed... Add a third dimension of cost and you've got the slightly bigger polygon of the SR71 but it costs a bazillion dollars per flight hour. So the Z-axis to the graph of cost. The SR71 is like a skyscraper compared to the new plane. The plane in the linked article is pretty cheap. It can fly in the part of the 3-d graph where the U2 can't and at maybe a hundredth the cost of the SR71. Also if can fly at speeds much slower than the SR71 at altitude. Its a pretty cool research tool. A really bad car analogy is NASA already has the worlds most expensive, fastest pneumatic torque wrench in the world AND also has the longest Phillips blade screwdriver in the world. However they've just obtained a pretty high end adjustable crescent wrench. Superficially, "aren't they all just tools?" "Is there any difference between those tools?" "can't they save money by having only one tool that tightens things?" but in practice that doesn't really work and having a new tool in the toolbox is going to help quite a bit for some of their jobs.