Two years ago, I took my husband's ashes to Colorado for his final resting place. I had the container in my carrry on, and a letter from the funeral home attesting to what it was. They did do a special xray/test of the container, but it wasn't a big deal. It might have helped I that I flew out of a smaller airport, but who knows. Although things might have changed lately. Most airlines' websites DO have a list of rules for transporting cremains.
Denise is right there are "regulations." I received advice from a native while i was out there who has orchestrated the scattering of ashes before, and his advise was "don't ask, don't tell." Just be discreet about it. My mom and I went "hiking" with a backpack, and when we got to the spot, we said our prayers and let him go quietly into the wind. We did wait 'til no one else was in the immediate area, but so many people hike/hang out on the trails/rocks, no one even gave us a second glance.
I did take a few pictures of the spot, and brought home a rock from where I left him :) The rock is on the edge of my garden now.
Good luck and blessings on your journey!
