Aerial refueling is an invaluable technique, not only extending a jet's operational endurance, it allows for more and heavier equipment to be carried than would otherwise be possible. Since its inception in the biplane era, this technology has developed into what you see here: two F-35C Lightning II jets attached to the business end of a Lockheed Martin KC-130 Hercules. At the same time. That's a first.
Image: Lockheed Martin / Andy Wolfe