from Hawaii and Ecuador: Be willing to try something new; yet travel with bottled water and Imodium AD!
Click here to find out how she learned to check baggage tags the hard way, and other ideas.
I've learned to roll my clothes instead of folding them to keep the wrinkles down, and to expect airport delays (and be delighted when all goes as scheduled and thank the staff profusely. They're so used to getting yelled at that it confuses them, but I think they like it). Also, to make sure that if I bring food on the plane, it doesn't have a really strong odor that could gross out my neighbors and/or make them stare longingly at my chow with puppy-dog eyes (kids are particularly good at this). I've also learned to hoard all uneaten snacks, because you never know when you're going to end up at an airport, starving, at 2 a.m., waiting for a connection. My mom swears by noise-cancelling headphones and eyeshades, but I haven't tried that yet. I feel I have to stay fully alert and aware of my surroundings at all times when in flight, because without me concentrating so hard on keeping the thing in the air, who knows what might happen!
What have you learned as you earned your frequent flier miles?