hiya,
in april i flew to new zealand with my Etanercept (and methotrexate too) and allthough i had infrormed the airline and the travel agent had sorted everything i still had lots of problems - culminating in my on the phone to an air new zealand supervisor in the middle of heathrow airport trying to fight back the tears! so this is what i had...
* fit to fly form completed by my GP (this might have been just because i had requested special assistance, or because of the airlines i was travelling with)
*letter from my Rheumatology nurse explaining what my injections were
*cool bag lunchbox (sounds silly, but it was compact enough to fit in hand luggage nicely so that i could keep an eye on it)
*plastic ice blocks - this was a big problem (Edinburgh airport security weren't going to let me through until i argued that it was medical supplies and terefore allowed to be more then 100ml of liquid - even though it was frozen!) at heathrow, the airline told me i could get ice from the stewards, but that they could not (as i was advised before) take my two spare ice packs and freeze them for me, so that i could swap over the ice mid flight.
i would recommend that you take sealable plastic bags, like the wee zip-lock ones because when they gave me ice, it was just in a normal plastic carrier bag and i was convinced the ice would melt all over my ipod and phone! the man at the check in desk actually told me i could 'pop' to boots and buy some zip-lock bags, this is after i had clearly come from the special assistance area in a wheelchair. fools!
I would also recommend booking special assistance if you have trouble walking fast or standing in queues for a long time - i wasn't too bad on my feet as it happened, but if i hadn't been scooped up in a wheelchair, and queue jumped at security checks etc, i would have definately missed my connecting flight.
basically advice is stand your ground and keep lots of documentation with you in your hand luggage, and don't forget your toothbrush