the article from :http://en.wikipedia.org/wiki/USAS_%28application%29
中国民航离港系统建设于1988年，是引进美国Unisys公司的USAS产品，属于为航空公司和机场旅客服务的大型网络系统。中航信通过其全球分销系统（GDS global distributing system）、离港控制系统DCS(departure control system)和客位控制系统ICS(inventory control system)向国内各地区航空公司、旅行社和机场提供可靠、高效的旅行代理、机场登机手续办理和航空公司定位服务，系统规模列世界前5位，每天处理超过50万人次旅客的订座和离港操作。有统计数据表明，中航信订座系统和离港系统的每秒最高交易处理量近5年来呈持续大幅增长态势。
据中航信技术人员介绍，目前(2006年)中航信的生产系统是 dorado 280主机和Unisys的CS7802主机，正是Unisys的CS7802主机上面运行着ICS（Inventory Control System，订座系统）和DCS（Departure Control System，离港系统）。因此，全国各大机场的离港系统都依赖这台CS7802主机，由于离港系统对实时性和安全性的较高要求，所以全国各大机场几乎所有的离港系统都由中航信来集中提供。
The USAS application suite is a series of diverse and relatively complex mainframe applications written for the Unisys 1100-series, 2200-series, and Clearpath IX environments. These applications are generally intended for use in the airline, transportation, and hospitality industries.
Older USAS applications such as USAS*RES (Reservations System) or USAS*FDC (Flight Data Control) were written originally in Fortran, but elements of various applications were also written in COBOL, Unisys 1100/2200 assembly language (ASM or MASM), and the LINC 4GL.
USAS application mainly developed for Airlines business use. There were many applications in USAS suite. Check-In, Reservation, Cargo operations are the main suites. Lufthansa IT systems plays a major role in developing USAS suite.
Most (if not all) USAS applications are written as text-based online transaction systems which are designed for low overhead and fast response times. The environment most commonly used is HVTIP (short for High-Volume TIP).
The original USAS applications such as USAS*RES (Reservation System), USAS*CGO (Cargo Application) was written in the early 70s and were adapted in different forms in varying degrees of customization.
With recent advancements in computing technology however, the USAS line of products is slowly diminishing and is being replaced (especially in the Airline industry) with other Open Source, Front-End products.
"USAS" was originally an acronym for Univac Standard Airline Systems, but the product line is now referred to simply as "USAS".
[edit] Current Users
Unisys Cargo Hosting Services, Minneapolis :: Delta Cargo, Air Canada Cargo
Lufthansa Systems, Frankfurt (does not include Lufthansa passenger Airlines)
Scandinavian Airlines (SAS), Copenhagen
Lufthansa Cargo Services
Air Iberia
Travel Sky, China
Amadeus
NorthWest (cargo)
All Nippon Airlines (ANA) Cargo
The USAS application suite is a series of diverse and relatively complex mainframe applications written for the Unisys 1100-series, 2200-series, and Clearpath IX environments. These applications are generally intended for use in the airline, transportation, and hospitality industries.
Older USAS applications such as USAS*RES (Reservations System) or USAS*FDC (Flight Data Control) were written originally in Fortran, but elements of various applications were also written in COBOL, Unisys 1100/2200 assembly language (ASM or MASM), and the LINC 4GL.
USAS application mainly developed for Airlines business use. There were many applications in USAS suite. Check-In, Reservation, Cargo operations are the main suites. Lufthansa IT systems plays a major role in developing USAS suite.
Most (if not all) USAS applications are written as text-based online transaction systems which are designed for low overhead and fast response times. The environment most commonly used is HVTIP (short for High-Volume TIP).
The original USAS applications such as USAS*RES (Reservation System), USAS*CGO (Cargo Application) was written in the early 70s and were adapted in different forms in varying degrees of customization.
With recent advancements in computing technology however, the USAS line of products is slowly diminishing and is being replaced (especially in the Airline industry) with other Open Source, Front-End products.
"USAS" was originally an acronym for Univac Standard Airline Systems, but the product line is now referred to simply as "USAS".
[edit] Current Users
Unisys Cargo Hosting Services, Minneapolis :: Delta Cargo, Air Canada Cargo
Lufthansa Systems, Frankfurt (does not include Lufthansa passenger Airlines)
Scandinavian Airlines (SAS), Copenhagen
Lufthansa Cargo Services
Air Iberia
Travel Sky, China
Amadeus
NorthWest (cargo)
All Nippon Airlines (ANA) Cargo