User: How many engines does the presidential plane, ‘Air Force One’, have?
Assistant: Air Force One is a Boeing 747-200B, which has four Rolls-Royce RB211 turbofan engines. The engines are the largest ever built by Rolls-Royce, and they are the most powerful engines ever built by the company. The RB211 is the most powerful engine ever made by Rolls-Royce, and it is the most powerful commercial jet engine ever made.