SkyTeam is an airline alliance founded in 2000. Its centralised management team is based on the grounds of Amsterdam Airport Schiphol, Netherlands. In terms of the number of passengers and the number of members, SkyTeam is now the second largest alliance in the world, second only to Star Alliance and ahead of Oneworld. SkyTeam operates with the slogan: Caring more about you.
Source: Wikipedia

Full members and some of their affiliates:
– Aeroflot
– Aerolineas Argentinas, including Austral
– Aeromexico (founding member)
– Air Europa
– Air France (founding member)
– Alitalia
– China Airlines, including Mandarin Airlines
– China Eastern Airlines, including Shanghai Airlines
– China Southern Airlines
– Czech Airlines
– Delta Airlines (founding member)
– Garuda Indonesia
– Kenya Airways
– KLM, including KLM Cityhopper
– Korean Air (founding member)
– Middle East Airlines
– Saudia
– TAROM
– Vietnam Airlines
– Xiamen Airlines

Former members:
– Alitalia-Linee Aeree Italiane
– Continental Airlines
– Northwest Airlines