I would say the F-22 and F-35 are _far_ more advanced than either the SR-71 or the U-2. I think spy planes have been made less critical and more vulnerable with

I would say the F-22 and F-35 are _far_ more advanced than either the SR-71 or the U-2. I think spy planes have been made less critical and more vulnerable with advancements in spy satellites, drones, and air defense and so are not a focus of R&D.