Possible Clues:

• Item that may be slid down inside a house
• Rail one's found in chaff
• Something to slide on
• Railing
• It's reassuring if you feel shaky on the flight
• Railing is included in joking
• A security device for the flight
• It can be found step by step
• Sounds like the record-breaking athlete is going up the stairs?
• Railing and repartee is accepted