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1 Department of Homeland Security. 2  The Department of Homeland Securityâs (DHS) mission is to secure the Nation from the many. threats and hazards we face. DHS is always on guard; endeavoring to reduce risks to the Nation, both those we anticipate and those that may be less predictable. Our mission requires continuous.
(Redirected from Passenger Service System) A passenger service system (PSS) is a series of critical systems used by airlines. The PSS usually comprises an airline reservations system, an airline inventory system and a departure control system (DCS). Generally the PSS is made up of modules that are used to manage different parts of the airlineâs business.