Three tech schools that fly under the radar: U of AL-Huntsville (mentioned by an earlier poster), FL Institute of Technology, and Missouri S&T.
UAH and FL Tech are well-regarded for engineering in general and aerospace engineering in particular. Missouri S&T used to be known as U of Missouri-Rolla. I would consider all three solid safeties for a student who has strong stats. Scholarship money should also be available.
Colorado School of Mines: Not really a safety, as I think most STEM hopefuls know how good the school is. Still, it would probably be a safety for a very solid student.