this invention relates to an air conveyor for conveying articles with a collar and a head arranged above that , in particular plastic bottles along a conveyor channel having two carrying strips arranged along the conveyor channel on which the articles are conveyed by suspending them from the collars , and having a head space having inclined side walls formed above the carrying strips . air nozzles , which act upon the heads of the articles , are provided in the inclined side walls . this counteracts a tendency of the articles to become tilted or jammed together .