What is "flatties"

Usage examples of "flatties".

A jeep-driven baggage train with a few scattered pieces of luggage on its flatties was parked beneath one wing of the Delta jet.

The conveyor made a wide circle on the apron where the handlers normally stood to unload the flatties, then re-entered the terminal through another hole hung with rubber strips.

Lars caught himself shivering and wishing they were watching' the old flatties that never put the viewer quite so much in the picture.

There were swans and ugly ducklings, arrowy racing sloops and broad-beamed Monterey fishing-boats, cabin cruisers and flatties, Star-boats and dinghies.

I dunno how the others do it, kill and not get the flatties down on 'em .