Generally, the more high-dollar and complex the item being sold is, the longer it takes for the sale to be made. The sale of a new commercial jet to an airline company such as U.S. Airways, Delta, or American Airlines can take literally years to be completed. Sales such as these are risky for companies. The buyers are concerned about many factors, such as the safety, reliability, and efficiency of the planes. They also generally want the jets customized in some way. Consequently, a lot of time and effort is needed to close these deals.