S3 Aerodefense LLC

S3 Aerodefense LLC, a small business aerospace defense supplier based in Glendale, Wisconsin, supplies aviation spare parts, aircraft components, and maintenance, repair, and overhaul services to the Department of Defense and Coast Guard as a prime contractor (96% of awards) and subcontractor on major defense programs. The company competes predominantly in full-and-open procurements, with recurring small-business set-asides on select Defense Logistics Agency (DLA) vehicles; recent awards carry mixed set-aside postures (Total Small Business and no-set-aside designations appear roughly evenly distributed across the prime footprint).

S3 Aerodefense's customer concentration is extreme and agency-specific. DLA Aviation dominates by overwhelming margin—1,773 awards carrying $205.2 million in combined potential value represent 95% of awards and 96% of combined potential value. DLA Land and Maritime places a distant second with 451 awards and $21.8 million. The U.S. Coast Guard (76 awards, $9.9 million), Naval Supply Systems Command (31 awards, $8.9 million), and DLA Troop Support Construction and Equipment (41 awards, $3.1 million) complete the active set. The concentration signal is unambiguous: S3 Aerodefense is a DLA Aviation specialist. Recent concrete work includes a $2.125 million definitive contract awarded April 15, 2026, for 377 fire sensing elements (aircraft alarm systems) under full-and-open competition, a $1.192 million definitive contract awarded January 22, 2026, for 1,024 spark gas igniters for KC-135 aircraft, and a $483 thousand definitive contract awarded July 15, 2026 (via U.S. Security Assistance Command), for UH-60M Black Hawk helicopter parts under Foreign Military Sales Case LO-B-BAB for the Slovak Republic.

S3 Aerodefense holds a portfolio of single-award Indefinite Delivery Contracts with DLA Aviation, each valued at approximately $2 million to $2.5 million with completion dates extending through 2027–2029. These IDVs establish the primary vehicle through which the vendor issues task orders for specialized aircraft components, bleed air ducts and duct assemblies, sensing elements for fire detection and forward-looking infrared systems, engine starters, electrical components, and environmental control system parts. The vendor also holds single-award IDVs with DLA Land and Maritime for rigid shaft couplings, ignition leads, and air conditioning duct assemblies, each capped at $350 thousand with one-year terms. Additionally, S3 Aerodefense sits on the Basic Ordering Agreement Sustainment Track (BOAST) Program, a multiple-award BOA established by Army Contracting Command Warren on April 3, 2026, for Class IX supplies (aviation spare parts and sustainment materials) with orders authorized through April 1, 2031.

Capability scope centers on bleed air ducts, duct assemblies, flexible couplings, sensing elements (forward-looking infrared and fire detection), aircraft lights (navigational, landing, taxiing), engine components (starters, generators, igniters), hose and tubing assemblies, and aircraft subsystem components (manifolds, actuators, valves, seals, brackets, and fasteners). Supporting NAICS categories are Other Aircraft Parts and Auxiliary Equipment Manufacturing (913 awards), Aircraft Manufacturing (265 awards), Motor Vehicle Electrical and Electronic Equipment Manufacturing (155 awards), and Aircraft Engine and Engine Parts Manufacturing (132 awards). Primary PSC codes are Airframe Structural Components (768 awards), Aircraft Air Conditioning, Heating, and Pressurizing Equipment (270 awards), and Hose and Flexible Tubing (238 awards). Performance locations include River Hills and Glendale, Wisconsin; Los Alamitos and Valencia, California; and subordinate Department of Defense facilities.

Recent subcontractor footprint names The Boeing Company (C-17 Globemaster III sustainment and materials), Leidos Inc. (repair and return of assets for Taiwan and Romania under Foreign Military Sales), Bell Boeing Joint Project Office (V-22 Phase 2 consumable market basket aerospace support), L3Harris Technologies Integrated Systems L.P. (RC-135 sustainment), Defense Systems and Solutions (V-22 management materials), and S & K Federal Services LLC (Army Security Assistance Enterprise foreign military sales repair). These relationships position S3 Aerodefense within the supply chains of major defense integrators, typically delivering component-level repair, overhaul, and spare-parts support.

Activity has grown substantially over the past five years—208 awards in 2022 to 437 in 2025—and remained at 213 awards through October 2026 (the year-to-date counts are incomplete). The vendor faces a recompete cliff of 322 awards (combined potential value $40.5 million) completing within the next twenty-four months, representing both exposure and opportunity in the DLA Aviation and DLA Land and Maritime renewals. Recent obligated dollars total $206 million across $260 million in combined potential value (79% obligation rate), indicating substantial invoiced revenue backing the vendor's steady activity trajectory.

As a small business, S3 AeroDefense, LLC. is an award winning provider of military aircraft spares, component repair services, and supply chain solutions to global military operators. S3's global presence extends to over 55 countries on 6 continents.

S3 AeroDefense is driven by a vision to deliver cutting-edge and cost-effective solutions to military aviation aftermarket sectors.