The airline industry in 2015 is likely to be healthy again because of mergers and falling jet fuel prices, and while consumers might be stuffed into slimmer seats in coach, at least they will be able to enjoy new and upgraded planes and more onboard amenities, such as Wi-Fi and streaming video. "2015 is poised to be one of the best, if not the best, years for the U.S. airline business," said Henry Harteveldt, a travel industry analyst with Atmosphere Research Group.