Different kind of airport question....

I'm wondering a few things about the Louisville Airport.

We live in the west end and my son used to love seeing things going on during our school commute, now that he goes closer to home he is missing the planes and seeing the world port hanger.

He is 12 and obsessed with aviation, so much so he applied for the Shawnee program.

We go to Bowman to sit and watch occasionally but I am wanting to surprise him with more, so...query :

Can we just...hang out at the airport...for fun? Without raising eyebrows?

Can we find a spot to plane watch without going through security?

Best spot to eat inside?

Any cool trivia or things he might enjoy knowing or seeing?

Thanks in advance for any info!