SkyserviceUSA is part of the mixed-up, complicated set of US operations of Airtours plc (a British company). The A320 and DC-10 are flown by crews from Ryan International (not RyanAir). The A320 operates mostly to Mexico, the DC-10 to Hawaii. I'm not sure of the details of the A320 operation, but I know that the DC-10s operate LAX-HNL for SunQuest Holidays and SFO-HNL for SunTrips, both travel agencies are part-owned by Airtours. Don't ask me why they're operated separately; I don't know. I'm not sure why they use the name SkyserviceUSA on the planes, but I do know that the Canadian airline Skyservice is part-owned by Airtours as well. The DC-10s were formerly with Sun Country Airlines.