To keep my laptop closed and manually edit, edit, edit.
The benefit of flying only a short distance is that you don't really have the time or inclination to turn the laptop on (unless you're a putz who wants to look really important...). So, I've printed several chapters and am prepared with a blood pen to scratch, claw, and rip my way through the flight. Hopefully what's left in this carnage will be great revisions for the evening in my hotel room.
Wish me luck and good writing to all!