I snipped the United stuff. That only works assuming there's room and it's not an RJ. But you're right, they never weigh them, it's more about volume.I've never been questioned or had my carryon's weighed In this part of the world. Asia is different as you know, they enforce the 15lb carry on limit. If I was ever called on weight going to the Caribbean, I would do what I do for Asia. Which is my housing, complete with Nikon D90 inside goes in the carryon (just under 15lbs). Arms go in my checked luggage. Both strobes go in my Scotte vest. Easy fix. 2 of the best investments I've ever made, AO Cooler and Scotte vest! Similar adjustments are made to my vid gear too. Lights in my vest, arms checked, housing and cam under 15lbs in back pack.
I stopped carrying anything in a regular carry-on after the time EVA bitched about my bag being too big for one of their 747s and that was in business class. I convinced them it was so important to me that I'd die without it, so they stuck it in one of their utility closets to shut me up. My housing is heavy (metal, not plastic), my Ike strobes and batteries are heavy, and I can't do too much without the arms anyway so it all gets checked. Camera and lenses go on my waist in a fanny pack, laptop and reg in my backpack, they can easily fit under the seat of any sort of plane.