I am travelling with a medication that needs to be cool at all times, will the airline allow me to use the onboard chiller?

As part of a flight crew (I flew for middle east regional for the last 4 years with a B747), I am trained to help my passenger as best as I can. But I'm also trained to stay away from any possible hazard and to not taking extra responsibility whenever I can.

Your medication is tied to your survival. That is not something I would gladly accept to be responsible for when I have little to no real knowledge on how to handle the item (because every item have its own needs of handling). How much space does it needs, how cold does it need to be, can it handle turbulence, what do I have to do in case of leakage, can I put it together with other stuff such as food in the chiller, etcetera.

Not to mention (even if you happen to be flying with me and we do have a chiller), there is problem of space. There is too much risk involved in putting all the responsibility of the well beings of your life guarded medicine into the hands of a strangers. Best way of doing it, IMO, is to ensure its safety yourself.

Flight attendant are trained in the form of safety and service. To take responsibility of passenger's belongings is hardly in our menu (except for safety issue item such as bombs on board, we might get some training on what to do about it. But handling medication that needs special handling is not. At least in my company).

In my experience, I once brought a bottle of liquid on board that was around 300ml (i.e. more than the allowed size) that contained a medical solution that was needed for my survival. I gave a detailed explanation of what it was during the boarding hand luggage scan, and was allowed to bring it on. I believe in the same manner you could bring your cooler with a few ice packs with you and keep your medicine with you at all times.

Of course this does not give any guarantees, it's up to the discretion of the airline/airport staff.

The simplest solution is to be self-reliant. Use artificial "ice-packs", insulation, and your carry-on luggage. Do not allow protein-based drugs to go through scanning machines.

When purchased from a mail-order pharmacy, most such refrigerated medicines are shipped with "ice-packs" in a foam-insulated box. These boxes are usually too large to fit inside a carry-on bag, so buy a small foam-insulated freezer bag or foam-insulated fanny pack that is large enough to hold the "ice-packs" and your drugs. (If you cannot purchase such a container, cut down a foam-insulated box to a suitable size, and use duct tape to hold it together.) Sandwich your drugs between the "ice-packs", and put the sandwich in your small foam-insulated container. Put the container in the middle of your luggage, with clothes on all sides. (The clothes will provide additional insulation.)

Make sure that your carry-on bag satisfies the requirements of all of your airlines, and make sure to bring it onboard. Do not allow your drugs to be treated as checked baggage. Checked baggage is scanned (or even deliberately irradiated to cook anthrax). The scanners can partially cook your drugs!

If any of your airports have X-ray scanners or body-scanners, make sure that your drugs do not go through the scanners. Declare your drugs to the inspectors, and ask them to hand-inspect them. You will need to make sure that your container is easily unzipped (or the duct taped lid can easily be removed and reattached), so that your drugs can be easily inspected. Do not allow protein-based drugs to go through the scanners!

Do you actually have to keep insulin cold? I know diabetics who store insulin in a refrigerator at home and on vacation, but simply carry it in their carryon while traveling -- no ice or insulation. This seems to be normal -- the website diabetes.co.uk says:

While it’s best to be prepared, insulin can handle short trips when not refrigerated.

It’s the exposure to extremes of heat that can deactivate it. Keep insulin in hand luggage if you are taking a plane - if it goes in the cargo hold with the luggage it might freeze which will deactivate it.

So I don't think you have to worry as much as you might think. Of course, I am not a doctor and my advice is only based on my reading and observations, so you have to make your own call.

We have been allowed to travel with cooling bag and cooling element before. We needed to show a letter from the doctor we needed this medication and that it needed to be kept cool. (not required by the airline, but required by the airport security control, so best to check with them beforehand what exactly they require)