A flight refers to the journey of an aircraft through the air, typically from one location to another. Flights can be operated by various types of aircraft, including airplanes, helicopters, drones, and even spacecraft. They are commonly used for transportation of passengers, cargo, or both. Commercial flights, operated by airlines, are scheduled services that transport passengers and cargo between different cities, countries, or continents. These flights adhere to specific departure and arrival times, and passengers typically purchase tickets in advance to reserve seats.