ITA Airways, formerly Alitalia, exited SkyTeam earlier this year (read more here) when the Lufthansa Group took a stake, but the alliance-wide benefits continued until April 30th.
The airline is expected to join the Star Alliance sometime next year, when its integration with Lufthansa Group airlines (Lufthansa, Swiss, Austrian, Brussels, and others) is complete.
A great solo travel tip spotted this week on LoyaltyLobby.