Flight Assignment: A.T.P. ("Airline Transport Pilot" or simply "ATP") was a flight simulator

Flight simulator

A flight simulator is a device that artificially re-creates aircraft flight and various aspects of the flight environment. This includes the equations that govern how aircraft fly, how they react to applications of their controls and other aircraft systems, and how they react to the external...

 for personal computer

Personal computer

A personal computer is any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end-user with no intervening computer operator...

s released in 1990 by the now-defunct subLOGIC

SubLOGIC

The subLOGIC Corporation is an American software development company. It was formed by Bruce Artwick when he was at the University of Illinois at Urbana-Champaign, and later incorporated by Stu Moment....

. It runs on MS-DOS

MS-DOS

MS-DOS is an operating system for x86-based personal computers. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for IBM PC compatible personal computers during the 1980s to the mid 1990s, until it was gradually superseded by operating...

 based PCs. The simulation models the Boeing 737

Boeing 737

The Boeing 737 is a short- to medium-range, twin-engine narrow-body jet airliner. Originally developed as a shorter, lower-cost twin-engine airliner derived from Boeing's 707 and 727, the 737 has developed into a family of nine passenger models with a capacity of 85 to 215 passengers...

, 747

Boeing 747

The Boeing 747 is a wide-body commercial airliner and cargo transport, often referred to by its original nickname, Jumbo Jet, or Queen of the Skies. It is among the world's most recognizable aircraft, and was the first wide-body ever produced...

, 767

Boeing 767

The Boeing 767 is a mid-size, wide-body twin-engine jet airliner built by Boeing Commercial Airplanes. It was the manufacturer's first wide-body twinjet and its first airliner with a two-crew glass cockpit. The aircraft features two turbofan engines, a supercritical wing, and a conventional tail...

, Airbus A320

Airbus A320

The Airbus A320 family is a family of short- to medium-range, narrow-body, commercial passenger jet airliners manufactured by Airbus Industrie.Airbus was originally a consortium of European aerospace companies, and is now fully owned by EADS. Airbus's name has been Airbus SAS since 2001...

 and Shorts 360

Shorts 360

The Short 360 is a commuter aircraft built by Short Brothers. The Short 360 seats up to 36-39 passengers and was introduced into service in 1981. It is a larger version of the Short 330.-Development:...

. It features most major aviation beacons in the United States and about 30 major airports. It also includes a multi-voiced air traffic control

Air traffic control

Air traffic control is a service provided by ground-based controllers who direct aircraft on the ground and in the air. The primary purpose of ATC systems worldwide is to separate aircraft to prevent collisions, to organize and expedite the flow of traffic, and to provide information and other...

 simulator.

The game's July 1990 release was snarled by a lawsuit from Microsoft

Microsoft

Microsoft Corporation is an American public multinational corporation headquartered in Redmond, Washington, USA that develops, manufactures, licenses, and supports a wide range of products and services predominantly related to computing through its various product divisions...

, which claimed ownership of some of subLOGIC's source code rights, and it was settled with a number of concessions on the part of subLOGIC, most notably dropping the phrase "flight simulator" from all of its products. This allowed the release of ATP in December 1990. Releases and updates continued through 1993.

Sierra, who bought subLOGIC in 1995, had planned a re-release of ATP for Windows in the late 1990s but this never came to fruition.