How does a graph like this get made for an aerospace company like this -- or I suppose any giant company -- where there are long-term contracts with some significant risk, or current sales that may include a contract for years of included maintenance, as well as sales of hardware alone? I know accounting isn't trivial and there are proper methods of balancing all of this each year, so I suppose I'm asking if someone has a hint as to how this stuff all gets tucked away in a chart like this? (Tbc this is a question reflecting my basic ignorance of accounting -- I'm not saying anything is missing or not properly represented; I am asking if someone might explain how all these types of contracts with complex breakdowns are represented in this visualization)

(Also OP needs to include the source in the image, including date created and date of dataset,)