A flight engineer is a highly skilled technical personnel who monitors aircraft systems and ensures their proper functioning during flights. Some synonyms for a flight engineer include aircraft maintenance engineer, aviation technician, aviation engineer, aircraft systems specialist, airplane mechanic, and airframe and powerplant mechanic. Additionally, some flight engineers may also be referred to as air crew members or specialist crew. While the specific title may vary depending on the organization and type of aircraft, each title refers to the same essential role, that of a technical expert who plays a crucial part in maintaining the safety and security of an aircraft and its passengers.