I have had the same experience in the States and Europe, but when I went to Hong Kong (with the prescription and a note in Chinese and English about why I needed it) last year, on my return flight, the pilot decided it was too dangerous to have on the plane (because he didn't know what the liquid was - as if he knows the contents of everyone else's carry-on liquid containers) and my choice was to get off the plane or give up my Epipen. Of course, I had to give up my Epipen and, of course, they served food I was allergic to. When I complained about the $75 cost to replace it, I was sent a $50 voucher for future travel on Cathay (which I was flying on an American Airlines code-share). I now travel with a copy of the prescription and the box, but will also clear it with the airline before I travel to Asia again.