When traveling in a group, beware the inefficient traveler. In large groups of people, it’s easy to lose track of one person -- especially if you’ve got a perpetually late or disorganized person on your hands. Try to stick together, but if you’re traveling with adults and someone lags behind, get on your flight no matter what. It’s much easier for one person to get on another flight than to reschedule everyone in your group because someone was late.