Robertson was a multiengine rated flight instructor and avid aerobatic pilot.
Renowned aerobatic pilot Art Scholl was hired to do in-flight camera work for the film.
He is the first civilian to be honored with "professional aerobatic pilot" title in the country.
Pointing the plane's nose toward the ground is one of hundreds of maneuvers aerobatic pilots routinely perform.
He began flying in his late teens and wrote a book about his experiences as a competitive aerobatic pilot.
It is especially popular among military aircraft photographers and aerobatic pilots flying at air shows.
As for the glory, well, aerobatic pilots (do not call them stunt fliers) know who they are and who else is one.
She logged over 600 hours in the air and was an accomplished aerobatic pilot, flying her 1936 German biplane.
They're not professional aerobatic pilots; they have to earn a living like the rest of us.
According to Stewart, his experiences as an aerobatic pilot allow him to be a better airline pilot as well.