What This Means
That is a real unlock, not a token appearance. The 400 tier gives you the Alaska route immediately, and the same ship continues to anchor the higher tiers all the way up the ladder. If Alaska is your target, you do not need to wait for 800 or 1200 to get into the conversation.
The tier is thin overall, so 400 should be treated as a narrow entry point rather than a broad Alaska month. But the fact that the region opens here is important. It means the release gives lower-point players access to one of the strongest regions in the set without forcing them into the mid-tier bands.
If you want the better cabin mix and more consistent Alaska coverage, 800 and 1200 are the next steps. But the practical unlock is 400, and that is where the month starts for Alaska planning.