Airbus A320 in the context of Airbus Corporate Jets

Simultaneous opposite direction parallel runway operations, or SODPROPS, is a method of coordinating the arrival and departure of aircraft on parallel runways. Airports that have two parallel runways can use this method so that aircraft can arrive on one runway while another aircraft can depart simultaneously in the opposite direction on the parallel runway. For example, an aircraft can depart runway 09R while another aircraft lands on runway 27R. This potentially maximizes the efficient coordination of aircraft in certain weather conditions as well as aiding in noise abatement.

Aviation safety is the study and practice of managing risks in aviation. This includes preventing aviation accidents and incidents through research, training aviation personnel, protecting passengers and the general public, and designing safer aircraft and aviation infrastructure.The aviation industry is subject to significant regulations and oversight to reduce risks across all aspects of flight. Adverse weather conditions such as turbulence, thunderstorms, icing, and reduced visibility are also recognized as major contributing factors to aviation safety outcomes.

Aviation security is focused on protecting air travelers, aircraft and infrastructure from intentional harm or disruption, rather than unintentional mishaps.

An airliner is a type of airplane for transporting passengers and air cargo. Such aircraft are most often operated by airlines. The modern and most common variant of the airliner is a long, tube shaped, and jet powered aircraft. The largest of them are wide-body jets which are also called twin-aisle because they generally have two separate aisles running from the front to the back of the passenger cabin. These are usually used for long-haul flights between airline hubs and major cities. A smaller, more common class of airliners is the narrow-body or single-aisle. These are generally used for short to medium-distance flights with fewer passengers than their wide-body counterparts.

Regional airliners typically seat fewer than 100 passengers and may be powered by turbofans or turboprops. These airliners are the non-mainline counterparts to the larger aircraft operated by the major carriers, legacy carriers, and flag carriers, and are used to feed traffic into the large airline hubs. These regional routes then form the spokes of a hub-and-spoke air transport model.

In aeronautics, a spoiler (sometimes called a lift spoiler or lift dumper) is a device which increases the drag and decreases the lift of an airfoil in a controlled way. Most often, spoilers are hinged plates on the top surface of a wing that can be extended upward into the airflow to spoil the streamline flow. By so doing, the spoiler creates a controlled stall over the portion of the wing behind it, greatly reducing the lift of that wing section.

Spoilers differ from airbrakes in that airbrakes are designed to increase drag without disrupting the lift distribution across the wing span, while spoilers disrupt the lift distribution as well as increasing drag. However, flight spoilers are routinely referred to as "speed brakes" on transport aircraft by pilots and manufacturers, despite significantly reducing lift.

A domestic flight is a form of commercial flight within civil aviation where the departure and the arrival take place in the same country.

Airports serving domestic flights only are known as domestic airports.