I just noticed a few weeks ago that they split up the seat categories to more than just First & Main Cabin.
Now I frequently see negative numbers under Main Cabin.
In the image below, I see 6 First Class & 19 Comfort+. But is the main cabin oversold by 17? Is the actual total number of unsold seats 6+19-17 = 8?
http://i.imgur.com/zJjlCrj.jpg
