TechBear, is the belt really a requirement for keepng the UK up or will it just slide down your hips a bit? I have one that is big in the waist without a belt, but would not fall all the way down with out some help from me. I have flown in both my UK's and never had a problem. For the shoe/boots, when approaching security, I list my foot up, bending that leg at the knee, and hold it near the opposite knee and loosen the laces, then repeat for the other foot. Then I just slip them off when I get to the conveyor belt and through them in a bin with the belt, pull the laptop out and put it in a bin, then push the carry-on bag and laptop bag through the scanning machine. I then step through the X-ray, and retrieve my stuff. I put the belt on first, then put the shoes on the floor and slip them back on, but don't bother to tie them at that point, get the laptop back in its bag, grab the other carry-on and head toward my gate. I will either tie my shoes once I get to the gate and can take a seat, or if I see a bench or other low surface that I can rest my foot on, I will stop, put my foot on the surface and tie up the shoes. I am also able to tie my shoes by just bending over and tying them. I have never given anyone an eyefull while doing so (at least I have heard no laughs or sniggers!), but if you are concerned, bend your knees a little bit while using that approach. Just think through what you need to do, and you will have no problems.

All in all, I find getting my 6' 3", 225lbs butt into the airplane seat while trying to sweep the pleats is much harder than going through security!