An older pilot was given a young Co-pilot to break in. The young guy asked the oldster, "Hey, gramps. How much time do you have in this plane?" The old guy thought a minute and said, "Oh, about 4000 hours." The young guy amazed said, "Wow, 4000 hours in jumbos. That's a lot of time." The old guy replied, "No, I mean I have 4000 hours in this plane." Points to another sitting a little further down the line, "I have 6000 hours in that one and 3000 hours in that one over there".