IAD: Cessna 4FR would you like an intersection takeoff at Y3, 4500 feet remaining. 4FR: Affirmative. IAD: Navion 27K would you like the intersection, 4500 feet remaining. 27K: Affirmative. (slight pause) IAD: Cessna 4FR, looks like there's really only 4000 feet remaining can you take that. 4FR: Affirmative. IAD: Navion 27K can you take 4000' 27K: I only need 850 feet.