RE: URGENT...which carrier to take on my trip????
I can't remember how old your DS is, but have you tried the hip carry in the pouch? He may like that better.
But I would take whichever one you feel the most comfortable using. If you take the Zolo, you will almost certainly have to take him out of the sling at security (due to the metal rings), but there is no guarantee that you won't have to take him out of the sling anyway.
Just give yourself plenty of time and you'll be fine. :)
HTH,
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)