Technically, with a standard FAA Private Pilot License (PPL) in the United States, there is no inherent maximum weight limit on the aircraft you can fly, provided you obtain the necessary "Type Ratings" for specific large or complex planes. Most PPL holders stick to small single-engine aircraft under 12,500 pounds, but if you have the resources to complete the rigorous training, you could legally pilot a Boeing 747 as a private pilot—though you cannot fly for compensation or hire. Famously, actor John Travolta holds a private license and has flown his own Boeing 707. However, in many other jurisdictions like those under EASA (Europe), a PPL is often restricted to non-complex aircraft with a Maximum Take-Off Weight (MTOW) of 5,700 kg (about 12,566 lbs). For most people, the "largest" realistic plane without massive extra certification is a high-performance single or light twin-engine aircraft like a Beechcraft King Air or a Cessna Caravan.