Here is a list of the brightest satellites on Sep 4.
The brightest is about magnitude 2.3. As noted in other posts, it is just possible to see Venus in daylight when you know where to look, and its magnitude is probably around -4 or less at those times. That is something like 300 times brighter than any satellite on Sep 4, and you didn’t know where to look.
That, combined with the fact that you saw your UFOs in the a part of the sky that was evidently an air traffic corridor, makes it very, very likely that you saw a high-flying plane.