For flights to Europe, check New York, Boston, and Washington. For flights to South America, check Miami and Houston. For flights to Asia, check Los Angeles, Las Vegas, and San Francisco. Make sure that you leave at least 3-4 hours between flights to account for delays and terminal changes. I tend to leave much longer layovers and spend the time in an airport lounge so that I can get a free meal, take a shower, and get some work done.
