Don’t act surprised drinks are free in first class.
Wear grey to avoid noticeable stains that may occur in-flight.
Make sure to buy a reputable magazine/newspaper preflight to loudly ruffle, annoying the person next to you. NY Times, WS Journal, The Economist will all do nicely. If a conversation is sparked with a fellow passenger, make sure you reference trips to other exotic places every chance you get. Speak to them like they’ve never traveled or been in a plane before. If they haven’t tell them about all the things that can possible go wrong in the plane, resulting in disaster. Send drinks back to the stewardesses or “flight attendants” often, and treat them like they are waitresses in an all-night rest stop diner on the outskirts of Mobile, AL.
Wait, this may be a post about how to be an asshole while traveling. Oh well, learn it well and use it anyway.