The skies were not friendly to travelers in 2006, and while they won't be much kinder in 2007, there are some positive developments afoot for passengers. Coming off a year of airline bankruptcies, domestic routes being slashed, and airfares skyrocketing between 10 percent to 18 percent, 2007 could be viewed as an improvement on a couple of fronts. First, seating capacity is expected to inch higher,