Related Clues:

• Cares a lot about powered flight
• Step in which Fred shows no limits
• Small domestic animals brought up stairs
• Instructional units
• One coming down for a landing?
• What a pedometer counts
• Dancer's repertoire
• One going from floor to floor
• Advances, with ''up''
• Alternative to the elevator
• Reportedly look hard at step
• Parts of a staircase
• Celebrity's ringed one? That should be "rung"
• Steps from dancer with no limits
• Story spanners