Friedman Memorial Airport: The Gateway to Sun Valley
Friedman Memorial Airport (SUN/KSUN) sits at 5,318 feet MSL in Hailey, Idaho, 12 miles south of Ketchum and the Sun Valley Resort. Its single runway (Runway 13/31) measures 7,550 feet, which sounds adequate until you factor in the elevation, the surrounding terrain, and the temperature-driven density altitude that can exceed 8,500 feet on summer afternoons. SUN handled approximately 14,200 aircraft operations in 2025, with private aviation accounting for roughly 60% of total traffic.
The airport sits in a narrow valley flanked by the Smoky Mountains to the west and the Pioneer Mountains to the east. Terrain rises to over 10,000 feet within 5 miles of the runway. This geography creates one of the most operationally demanding approaches in U.S. private aviation: circling approaches, terrain-driven missed approach procedures, and strict visual requirements that can divert aircraft to Twin Falls (TWF, 65 miles south) without warning.
Aircraft Restrictions and Operational Limits
SUN imposes weight restrictions that effectively limit which aircraft types can operate. Maximum landing weight for the runway is approximately 80,000 pounds, which accommodates most midsize and super-midsize jets. Heavy jets like the Gulfstream G550 (MTOW 91,000 lbs) can technically operate but require significant payload restrictions. Ultra-long-range jets like the Global 7500 and G650ER are generally prohibited due to weight and approach category limitations.
- Light jets (CJ3, CJ4, Phenom 300): Full operations, no restrictions
- Midsize jets (Citation XLS, Hawker 800XP, Learjet 60): Full operations year-round
- Super-midsize (Challenger 350, Citation Latitude): Operate with weight monitoring in summer
- Heavy jets (G550, Challenger 604): Restricted operations, payload-limited in summer heat
- Ultra-long-range (G650, Global 7500): Generally prohibited or severely restricted
Sun Valley is a light-jet and midsize-jet airport. Passengers arriving on heavy jets typically fly to Twin Falls or Boise and transfer by helicopter or ground vehicle. The 90-minute drive from Boise to Ketchum is scenic but defeats the purpose of flying private for most travelers.
Approach Procedures and Weather Considerations
SUN's instrument approaches are among the most restrictive in the national airspace system. The LOC/DME approach to Runway 13 has minimum descent altitude (MDA) of 7,300 feet MSL, approximately 2,000 feet above the runway. Pilots who cannot acquire visual contact with the runway at that altitude must execute the missed approach, which involves a climbing left turn into the valley with rising terrain on both sides.
Seasonal Weather Patterns
Winter operations (December through March) bring frequent IFR conditions. Ceilings below MDA occur approximately 15-20% of winter mornings, typically clearing by mid-morning as the sun heats the valley. Snow removal operations can close the runway for 30-60 minutes after heavy snowfall. The airport does not have de-icing equipment on-field; aircraft requiring de-icing must depart with holdover time from their origin airport.
Summer operations (June through August) bring a different challenge: density altitude. On a 90°F afternoon, density altitude at SUN exceeds 8,500 feet. This reduces engine performance, increases takeoff roll by 20-30%, and limits payload. Most operators schedule departures for early morning (before 10 AM) during summer to avoid the worst density altitude conditions. Afternoon thunderstorms are common July through August and can close the airport with little notice.
