What capacity issues exist in the airline industry and what is the impact of empty seats on the profitability of an airline?

TWO parts:

1: Give an example of a company that is a manufacturer. How can they establish an ERP system that allows communication between departments to flow properly and to effectively manage capacity needs?

2: What capacity issues exist in the airline industry and what is the impact of empty seats on the profitability of an airline?

The book is Managing supply chain operations