# 2000 — Aeroméxico, Air France, Delta Air Lines, and Korean Air launched the SkyTeam alliance on 22 June.
# 2001 — CSA Czech Airlines (in March) and Alitalia (on 27 July) joined.
# 2003 - Delta's subsidiary Delta Express was replaced by Song.
# 2004 — Continental Airlines, KLM and Northwest Airlines joined on 13 September. Their simultaneous entry was the largest expansion event in airline alliance history. As a result of the three new members, SkyTeam passed Oneworld to become the second largest alliance.