Possible Clues:

• Team of flyers sounded triumphant, on song
• Pilot and assistants
• Those working on plane
• Pilot, co-pilot, etc
• Song by crow in the past, a busy flier
• Plane operators/workers
• Team up a lot of the time
• Regular high fliers in first class, boasted after run
• Excellent revue's opening, boasted flyers
• Plainsmen and plainswomen, say, highfliers at work