Comcast is launching its first-ever airport presence at its hometown’s hub, Philadelphia International Airport. The company announced Wednesday the arrival of five Xfinity-on-the-Fly lounges, where Comcast cable customers can stop before a flight to download TV shows, movies and DVR’ed content via the mobile app. Not only is the lounge the first for Comcast, it’s also the first cable-based airport service of its kind that Jon Sayer, vice president of national sales for Clear Channel Outdoor…