Quasar Cargo was a business that provided resources to the Liberty Task Force, an agreement facilitated by the Rebel Alliance through a contract with the Dunari.
During mission 5:2 of Star Wars: X-Wing Alliance, the player can observe ships belonging to this company. This occurs if the player recognizes the ships guarding the Liberty prior to entering hyperspace and completing the mission's primary goal. Their inclusion is solely for the purpose of enhancing the game's sense of authenticity and coherence (mission 5:1 revolved around establishing the supply protocols between the Alliance and the Dunari).