Masters of the Air is typically considered fictional. It might draw inspiration from various sources but doesn't represent a true account of actual events. Authors often create such works to entertain and engage the audience with imaginative plots.
Since it's based on a real story, the main characters could be pilots or aircrew members who made significant contributions during a particular period of aerial warfare. They might be those who had extraordinary flying skills, or who played important roles in strategic missions. Maybe there are some well - known heroes whose stories are being told, or even some unsung heroes who are finally getting the spotlight.
Masters of Air is purely fictional. It's the product of the author's imagination and doesn't draw from actual happenings. The story and characters are made up to entertain and engage the readers/viewers.