One word of caution there (aside from other dangers of benzos): I had a friend use them on a flight from the US to UK, and apparently was still obviously intoxicated from them when arriving, and got rejected at the border, put in a holding area, and sent back on the next flight. If going through a place where you'll actually have to talk with an immigration officer, not necessarily the smartest thing.

Wow what a nightmare. I try to time it so I'm lucid before landing, but that's a horror I hadn't even considered!