Some people dream about flying machines in order to escape the problems that they are facing in their waking life. Flying is a symbol of freedom, particularly when we have no control over our daily lives. For example, someone may dream of flying away from an abuser or a controlling parent. It may also represent feelings of powerlessness and an urge to escape responsibilities that feel overwhelming.
Other people may dream about working on flying machines where it represents their goals and ambitions towards access to greater adventure. The emphasis on the ability to fly can be interpreted as a need for more personal freedom, with more meaning given to those who are unable to live out these desires in their waking life.