I was looking at one of those flight schedule systems with the Galelio things for AC Z class tickets. It says Z6 what does that mean? Only 6 seats for Z class ticket holders? What do the numbers beside the class/ticket letter mean?

IE: 3 YYZ YUL 0900 1011 AC 404 J9 C9 Y9 M9 T7 B9 H9 V9 Q9 L9#320*B