James -
as others have said, the titanium rod in your skull won't set off the metal detectors. I've been through airport security numerous times since my implant surgery and haven't beeped once. I also have titanium mesh, screws, and a plate in my head from my AN surgery.
I am curious to see what will happen next time I go through security at O'Hare since they now have those new x-ray machines that are supposed to show "everything". I don't know if the x-ray machine will exclude the BAHA implant or not. Logic tells me it won't show up, but you never know. I think I'll keep my card from Cochlear handy just in case.
Just a note to those wearing the new BP100.
I've walked through airport security with my Divino on my head a few times, but because of the BP100's feedback manager - that will even "answer" a beep from your microwave - I'd suggest removing it before going through security.
Jan