In other words you have a problem with the idea that the plane which hit the Pentagon did so while keeping "level." In other words, a very low angle of incline so close to the ground. This is the way you meant, no? Wrong or not, you should clarify this if people are misreading.
Secondly, I don't think that's any indication all. Steering the plane is relatively easy compared with landing and takeoff, neither of which are skills the hijacker needed to crash it. He was also aiming at a large target, visible from a considerable distance.
Regarding the WTC, the plane nearly missed WTC 2; the hijacker had to adjust last second to hit it. Again, a large visible target is relatively easy to hit and a pilot whose not concerned about more advanced maneuvers isn't concerned with whether or not he's good at piloting.
You've provided conjecture that you claim to be circumstantial evidence of remote control. At best, you've done very little even for that. I'm not sure what he air liner not willing to comment on the plane is supposed to indicate about the likelihood of remote controlling it, you never mentioned the significance. The Hijacker's skill levels didn't need to be advanced to accomplish what they did, so I'm not sure what poor flight skills are supposed to indicate either... they didn't exactly care, they were training to fly only once.