I have been on numerous flights, many international with copaxone. I am very strict though that is not go through the xray. All but once i have had no trouble at all and they have just done a hand check. I also carry the gel cool pack with it and the auoinject in the travel case. I take the syringes out, hand them to the officer and tell them the rest can go through xray if they want - most of the time they say it is okay. Once, in Heathrow, i got opposition about the needles not going through the xray, i stood my ground and showed them the card from Shared Solutions that says it should not be go through the xray and he eventually agreed to not xray it.
I also carry a letter from my neuro stating that it is a prescription medication and is necessary to keep with me at all times, had their contact on it and i just hand that over first off so i don't actually have to do any explaining about why i have them (it also mentiones in the letter that cool packs may be required which has been handy since the no liquid rules).
For anyone thinking of travelling I would recomend getting a letter to carry with you (mine is a year old and it is still okay - you don't have to get a new one each trip) just in case you come up against an awkward security officer as there are some out there