Originally Posted by
LegalTender
Equipment that isn't specifically banned needs to be buckled securely for the safety of all. Since they reportedly had flown "several times before" with this equipment, I tend to think it was.
What do you mean by equipment? If something isn't specifically allowed to be attached to the seat, such as an FAA approved child seat or seatbelt extender, then it's a carry-on and needs to be stored in a closed overhead bin or under a seat. I have never heard the alternative of securely buckling a carry-on item.