Just for the record I've used my nickel plated options on a plane, but since you're going international I guess I would use something else.
I've got a set of Denise and while the needle wasn't bad I didn't like the cable. It's too thick and not as slippery as the Options. As far as needles I haven't tried the Zephyrs though. Whichever you go with I suggest taking a few sets with you then check the others so if they did take them you wouldn't lose the whole set.
I have a friend that puts some DPN in a pencil box and they never say anything.