Yes, it is. The movie 'Flight of the Intruder' was inspired by true events. It shows the operations, the challenges, and the mindset of the pilots during that time in a more or less realistic way. For example, it reflects on how the pilots had to deal with the complex and dangerous missions in the Vietnam War theater, which were based on actual military operations.
The main plot revolves around military aviation. It likely involves the adventures and challenges of the intruder aircraft and its crew during some sort of mission. However, without reading it in detail, it's hard to be more specific.