The best way to avoid problems at the airport is to pack as light as you possibly can. The more suitcases you have, the more time and nuisance they're going to be. You'll have to carry each of those bags from the cab, train or parking lot into the airport, and each one has to be checked in, weighed, X-rayed and inspected. In short, every bag will serve to delay you ever so slightly no matter how efficient you think you are. For short business trips, there's no need for more than a carry-on bag. For longer vacations, try to plan out your outfits according to need and keep it to one checked bag. With the Internet, there's no need to pack that extra sweater "in case it gets chilly." You should be able to pack specifically for your destination and keep it at that.