The vial you are currently using will be fine. The extra vials should be kept cold.

This is what I did on my last vacation:

I took a small insulated lunch bag on the plane. My insulin was inside the bag, along with a few snacks. I used cold packs to keep the insulin cold. When I got to my destination, I put my insulin into the hotel room fridge. When I was ready to come back home, I refroze the cold packs for the trip home.

I didn't have any problems except for the security people tell me I couldn't take my water bottle through the checkpoint. Okay...fine...I drank the water while in line and put the empty bottle into the bag. Once I got through the line, I refilled it at a water fountain. They didn't say a thing about my 2 fruitcups, 1 granola bar, 1 pack of snack crackers, 2 tubes of glucose gel and 1 roll of LifeSavers.

Make sure you have proper identification and keep the vials in the boxes that have the prescription labels on them. You can take your needles and lancets on the plane, along with your meter. My advice is to get one of those insulated lunch bags that have several compartments. That way, you can keep everything in one bag and have it easy to get to.

Have a nice trip.

EMT