Related Clues:

• Flight features
• Way up or way down
• Assembly-instruction parts
• Progress parts
• Reaches, as 18
• Staircase units
• You can take them in stride
• List of instructions
• Hitchcock's "The 39 __"
• Players take them
• "The 39 ___"
• Hangs a right
• Doughnuts, for instance
• Board-game spins
• Flight formations