Airline traveling with several small children in tow can be an adventure or a nightmare, especially if you feel frazzled or your little ones have melt-downs. Of course, you’ve probably already thought of what to pack in the carry-on bag, and how to keep your little ones occupied during the flight. However, to help keep yourself and your crew in check after you check-in, it’s a good idea to plan the first leg of the trip—getting to the airport. Here…