Ryan International uses DC-10s N571RY and N572RY out of LAX for flights to OGG (Maui) and HNL (Honolulu). The DC-10s used to have the registrations N571SC and N572SC, suggesting a lease from Sun Country. Also, these tri-jets, until recently, carried the title Skyservice USA. They now carry the title Sun Trips. Ryan International also used to fly DC-9s for the Postal Service (one of their planes crashed in 1991, this is how I know this) but I don't know if they still do this.