Aerial lifts transport skiers while suspended off the ground. Aerial lifts are often bicable ropeways, the "bi-" prefix meaning that the cables have two different functions (carrying and pulling).
Helicopters are used for heliskiing and snowcats for snowcat skiing. This is backcountry skiing or boarding accessed by a snowcat or helicopter instead of a lift, or by hiking. Cat skiing is less than half the cost of heliskiing, more expensive than a lift ticket but is easier than ski touring. Cat skiing is guided. Skiing at select, extreme resorts, like Silverton Mountain, is also guided, even when skiing just off of the lift.