Scientific Anglers Air Cel Trout Floating Fly Fishing Line - Why make things complicated? Scientific Anglers Air Cel Trout fly line is a simple, no-frills, weight-forward floating fly line perfect for throwing dry flies, nymphs, and streamers to trout in streams, rivers, or lakes. It may not cost a lot, but that certainly doesn't mean the Air Cel won't get the job done. Designed for trout fishing with a 5- or 6-weight rod