life preserver
preserver
flotation device

What would they do if the flotation device did not work properly or the plane flipped?

"In the event of water landing, I have been designed to serve as a flotation device."

It is a flotation device that a child sits inside.

All water skiers are required to wear an approved flotation device.

They just seem to have some kind of flotation device that keeps them buoyant.

Children relying on flotation devices and those under 4 who can swim are not safe in the water.

"There are flotation devices in the seat pockets, but I don't think we're going to need them today!"

I didn't think my seat cushion was going to double as a flotation device of any kind.

Someone should immediately gather all flotation devices and get the life raft ready.

Anyone who is in the boat must wear some kind of flotation device.