This is a still shot from the Eastern Air Lines promotional movie "Flying with Arthur Godfrey" which is really interesting to watch. In the movie they are departing Idlewild Airport in New York and starting engines before taxiing for takeoff. Instead of Idlewild, this scene was filmed at Miami International Airport. You can view the movie at:
http://www.youtube.com/watch?v=U6VfkKjlhXs&feature=player_embedded