But you do have to worry about............... 
“The problem with satellites is you have to wait for them to pass over the area of interest, which could take days.........”
Boeing’s X-37B has the ability to radically shift orbits and remain in space from 6 months to well overy a year. What it does is not known, but the reconnaissance potential is enormous.
You don’t have to worry about fragile scram jet engines, heat management, enemy SAM’s, etc.
But you do have to worry about...............