Korean Air
SKYPASS status is unusual: it is earned on lifetime accumulation of miles flown on Korean Air, not on a single year, so it never expires once reached. Korean Air is a SkyTeam founder, so Morning Calm Premium and Million Miler are SkyTeam Elite Plus. Confirm current thresholds on koreanair.com.
4 rungs, from the bottom up.
Qualification thresholds are the published ones as last checked and change most years; confirm the current numbers with Korean Air. Alliance equivalences and the lounge rules that follow from them move far more slowly.