Coming & GoingTraveling on Thanksgiving, eating at the airport, bus services expandThanksgiving travel tripsMore than 42 million people will be traveling this Thanksgiving, an 11.4 percent increase from last year, AAA estimates. If you're one of them, and you're planning to fly home from the District, expect some changes at Ronald Reagan National and W ashington Dulles International airports - for better or for worse.Let's start with the good news.Searching for a parking space won't be as difficult at National. Earlier this year, the Metropolitan Washington Airports Authority a dded more than 1,400 parking spaces to the airport's parking garages, bringing the total number of spaces to almost almost 9,000.Another addition to National: JetBlue Airways, which began service in Terminal A earlier...