I also agree with prior posters who say that Delta can't have it both ways. If the ticket says Delta and they say, "Thank you for flying Delta," then Delta does bear some accountability here.
It's not some accountability, it's 100%. The passenger never gave Skywest a dime. It's much like hiring a general contractor and giving him $500,000 to build a house. If he uses some of that money to hire a plumber who installs pipes that leak, he cannot tell you the plumber did it and walk away.
I expect we will see more and more issues like this as Delta continues on the path to becoming a virtual airline. I was reminded of this today when I received email spam from Delta with a link to a page that touted their global service. The top of the page was covered with Delta's logo and colors, followed by links to buy low fare tickets to Latin America. And way at the bottom of the page, in fine print, was this list of companies for Delta to blame:
A portion of travel for some itineraries may be on : Compass Airlines, Endeavor Air, Inc. ExpressJet Airlines, Inc., GoJet Airlines, Republic Airline, SkyWest, Aeroflot, Aeromexico, Air Europa, Air France, Airlinair, Air One, Air One City Liner, Alitalia, BritAir, China Airlines, China Eastern, China Southern, CSA Czech Airlines, KLM, Korean Airlines, Aerolíneas Argentinas; Austral Lineas Aereas dba Aerolíneas Argentinas, Aerolitoral dba Aeromexico Connect, Air One CityLiner dba Alitalia, CAIone Alitalia Express dba Alitalia, CAI Second, Aeromar, Brit Air dba Air France, Carpatair dba Alitalia, City Jet dba Air France, GOL Airlines, Hawaiian Airlines, Jet Airways, KLM CityHopper, Olympic Air, Hop! dba Air France, Privilege Style, Regional CAE dba Air France, Seaborne Airlines, Shanghai Airlines, SwiftAir, Transavia Airlines, Virgin Atlantic International, Aer Lingus dba Virgin Atlantic Little Red, Virgin Australia International, Virgin Australia Limited NZ dba Virgin Australia, VLM Airlines, WestJet, and WestJet Encore.