Ski Lift International (SLI) was an aerial lift manufacturer based out of Incline Village, Nevada. SLI was established in 1965 by co-founders Samuel G. Bonasso and Joseph Sugarman, with Bonasso as its first president. The company built 46 lifts, mainly double chairlifts, from 1965 until 1973. SLI had a prototype gondola and triple chair, but it is unlikely that these designs were ever used. SLI chairlifts can still be seen at ski areas such as Catamount Ski Area. The company was known for inventing the first maintenance-free bail chair, well before competitors such as Riblet or Hall. SLI shipped pre-welded towers and terminal parts to the ski areas, avoiding welding on site. SLI was purchased by Riblet Tramway Company in 1973. Since then more and more of these lifts have been removed due to mechanical failures or the need for higher capacity. These lifts are currently very rare and are still rapidly disappearing from the earth.

List of SLI lifts still standing

Alpine Slide-Big Bear Lake, California double Bryce Resort, Virginia A Double Sapphire Valley, North Carolina A Lift Double Bryce Resort, Virginia B Double Diamond Peak, Nevada Ridge Double Iron Mountain, California (CLOSED) - Chair 1 (Double) Iron Mountain, California (CLOSED) - Chair 2 (Double) June Mountain, California 4 Double June Mountain, California 2 Double Aspen Mountain, Colorado Shadow Mountain Double Wolf Ridge, North Carolina A Double Telluride, Colorado 7 Coonskin Double Telluride, Colorado Oak Street Double 49 Degrees North, Washington 2 Grubstake Double 49 Degrees North, Washington 3 Payday Double Teton Pass, Montana Chairlift Double Bighorn, Wyoming Beginner Double Heavenly, Nevada World Cup Double Wolf Creek, Colorado Nova Double Blacktail Mountain, MT Crystal Double (former C-5 at Crystal Mountain, WA) Ober Gatlinburg, TN Blue Double Mountain Run, Virginia (CLOSED) - Double