I just flew from San Jose CA to LA, then to Kona HI with no problem. A TSA fellow stepped back suddenly and then calmly asked about the bag; I replied that it is an ileostomy. Then I did have trouble with the metal detector for some reason (watch, then belt buckle; stuff I forgot to remove; stupid!). Clear bag for liquids wasn't even requested; stayed in carry on during inspection. All my supplies are now dry ones (wafers & pouches only) Another story- I previously had a baseball-sized stoma prolapse and couldn't keep wafers on; 3" tape and adhesive prep didn't help. Leaked often, then the burns prevented wafers from sticking for days, a week, no suggestions worked. Glad that's over.
I'd flown before with a port and expected the stainless steel on that to be an issue, but it never triggered a detector. I carried a card signed by my Doc., just in case.
(rectal cancer - removed 5/2009, failed take down 12/09, repaired 1/10, new stoma prolapsed ,repaired that 8/2010, strictures dilation 1/11, another set in 4/11, hopefully a takedown to follow this May)
Enjoy your adventures...