United Airlines released a new ad campaigntoday that offers heavy doses of Gerwshin's "Rhapsody in Blue" and brings back the classic "Fly the Friendly Skies" slogan that has been shelved since 1996. In a series of four made-for-TV ads, United returns to its aspirational roots, offering a welcome change from the drab ads embracing hard product that the Continental side of the airline had embraced since the merger. But the disconnect between ad and reality is readily apparent to every frequent flyer on United. Even as the airline tries to redefine the termfriendly, United is left with a credibility gap that must be addressed in order for these ads to be effective.