Plane spotting

My two yr old son is infatuated with airplanes and helicopters, in fact he spends more time on the computer on FS than I do. I take him to the local GA airport to watch take off, landings, and taxiing aircraft, which he absolutely loves.
I am going to take my video camera and get some video to make into a DVD for him to watch at home, beats watching Barney 20 times a day. Anyway i want to go to a larger airport (KMCI- in Kansas City to get some video of the "heavies" but I have no idea where to go to get the best shots, without drawing unwanted, or unwarranted attention to myself, ( i don't want a visit from security or worse the FBI). Other than going to a parking lot on the glide path, any ideas of where to get the best video shots.
I don't know of anywhere off airport property, but if anyone knows the area and can offer suggestions, it would be appreciated.
I am going to take my video camera and get some video to make into a DVD for him to watch at home, beats watching Barney 20 times a day. Anyway i want to go to a larger airport (KMCI- in Kansas City to get some video of the "heavies" but I have no idea where to go to get the best shots, without drawing unwanted, or unwarranted attention to myself, ( i don't want a visit from security or worse the FBI). Other than going to a parking lot on the glide path, any ideas of where to get the best video shots.
I don't know of anywhere off airport property, but if anyone knows the area and can offer suggestions, it would be appreciated.