J.D. and I are leaving for a 2 week vacation to California from New Jersey, next Sunday. This is his 6th or 7th trip.
He goes as carryon. I just got back from my vet to get his Health Certificate as (in New Jersey anyway) it needs to be dated within 10 days of travel. I also had my vet write a letter stating that he is diabetic and needs insulin and syringes on the plane with me. I put all his stuff (syringes, insulin in cooler bag, food, meds, etc.) in my "purse".
Besides a collar with an I.D. tag that has his name, my cell phone number, and "Diabetic" written on it, and lots of extra bells attached, he is micro chipped, and wears a well fitting harness and leash the entire trip (car rides to airport, in airport, plane trip, in airport, car rides from airport) each way.
I give him some Rescue Remedy for it's calming affect. I test him at home, when I get to the airport, right before we board, and the second we get off the plane. I find it impossible to test him while underneath the seat in front of us.