Possible Clues:

• Highly dangerous job I found opening river bed
• Airman, one getting stuck in river bed
• Cricket guide - one examining details of flight, spin, etc
• Chuck Yeager, at one time
• High-flying trial judge
• First man to take up a craft
• High flying river guide
• One assesses a crate's quality by giving it a spin
• First person to fly a plane
• One might check bombers pass current through river bed