Question: The 56th Air Refueling Squadron is an active unit of the United States Air Force, it operates Boeing KC-46 Pegasus aircraft, conducting initial and advanced aircrew training for air refueling operations, the Boeing KC-46 Pegasus is a military aerial refueling and strategic military transport aircraft developed by Boeing, from which one of its jet airliner?
Sentence (from "Boeing KC-46 Pegasus"): The first 18 combat-ready aircraft are scheduled to be delivered to the U.S. Air Force in early 2018 under the terms of the development contract.
Relevant evidence: No