LaCie Rugged drives will work, but they will drain your Mac battery in a hurry. I would guess you might get 2 hours of editing time if you have a brand new battery fully charged before the flight.
You may or may not get fully smooth playback, but I'm always surprised how much performance I can get from one of those little drives.
Walter Biscardi, Jr.
Biscardi Creative Media
biscardicreative.com