"International First and Business Class passengers as well as SkyTeam Elite Plus members traveling in Economy Class enjoy complimentary access to MOST SkyTeam partner lounges worldwide. Simply present your same-day ticket for an international SkyTeam airline flight. As a SkyTeam Elite Plus passenger, you can even invite a guest to join you in the lounge." from the Skyteam website. Note the Weasel word MOST, which I capitolized.

In addition to this weasel, does not skyteam offer arrivals lounges?

As an aside, when flying IAD-MXP on AZ in C, I was told by the AZ checkin desk that I could not use the AF lounge at IAD.