Families and summer air travel

Twin brothers Liam, left, and Rowan Miller, 7, wait in line with their parents, Scott and Cynthia Miller, to board a flight in Ft. Lauderdale, Fla., last week. Families and friends who want to sit next to each other when they fly may have to pay extra as airlines try to sell roomier premium seats. Some airlines also no longer allow families with young children to pre-board.