It’s snowing in Copenhagen as Norwegian Air Shuttle Flight DY7041 lifts off. There are nearly 300 passengers on board, most of them Norwegians, Swedes, and Danes eager to escape the gloom that engulfs their part of the world in late November. Today they will arrive in Florida faster than usual. This is the first direct flight from Scandinavia to Fort Lauderdale. And it’s a bargain: The tickets are a fraction of what larger airlines charge.