An aircraft is a vehicle that uses support from the air to take flight. The most popular examples of aircrafts are airplanes, helicopters, airships, blimps, and hot air balloons. Aircrafts use either static lift or the dynamic lift of an airfoil to counter the force of gravity to fly. Aircrafts can be manned by a pilot and onboard crew or unmanned by remotely controlled or self-controlled by computers in aerial vehicles. The first manned ascent and safe descent of aircrafts occurred in large hot-air balloons in the 18th century. Today aircrafts are used in the military, commercial sectors, or for experiments.