THE PRINCIPAL
THE INTERSECTION OF AVIATION ENGINEERING AND UNCOMPROMISING DESIGN.
Sarah Mespelt Larranaga bridges the critical gap between avant-garde spatial design and rigorous technical execution. With two decades of tenure across aviation design, engineering, project management, and maintenance oversight, her studio has directed the custom interior configuration, exterior livery execution, and final acceptance of more than 100 elite aircraft.
In the private aviation sector, true luxury is an optimization problem where aesthetics, mechanical integrity, and regulatory compliance must flawlessly align. Sarah Larranaga approaches every aircraft through a lens of systems-thinking. She ensures that bespoke materials and cutting-edge cabin concepts never compromise structural airworthiness directives, CAD precision, or asset valuation. From initial concept generation to final flight-line delivery, Sarah provides sovereign representation for discerning principals, corporate fleets, and international heads of state, guaranteeing that each asset performs as impeccably as it presents.
PROVEN AIRFRAME EXPERTISE ACROSS LEADING OEM PLATFORMS.
FLEET CAPABILITIES
Sarah’s technical execution spans over 100 successfully delivered assets. Her comprehensive design engineering, completion management, and return-to-service oversight cover the full operational spectrum of elite commercial, intercontinental, and rotary airframes.
Corporate Jets
Airbus Corporate Jets • Boeing Business Jets
Managing major wide-body structural modifications, bespoke cabin reconfigurations, long-range systems integration, and heavy maintenance coordination for head-of-state and corporate fleet profiles.
Ultra-Long-Range & Heavy Jets
Bombardier • Gulfstream • Dassault
Directing nose-to-tail interior transformations, custom exterior livery execution, complex avionics retrofits, and rigorous weight-and-balance engineering to preserve long-range flight envelopes.
Rotary Aircraft
Sikorsky • Bell
Developing specialized multi-mission cabins, high-end corporate utility configurations, specialized weight-sensitive materials integration, and absolute compliance with rotary-wing airworthiness directives.
COMPLETE OVERSIGHT FROM CONCEPT TO FLIGHT-LINE DELIVERY.
SERVICES
Sarah’s technical execution spans over 100 successfully delivered assets. Her comprehensive design engineering, completion management, and return-to-service oversight cover the full operational spectrum of elite commercial, intercontinental, and rotary airframes.
Spatial & Aesthetic Engineering
Cabin Design • Exterior Livery Design
Material Specification
Developing avant-garde cabin configurations and custom exterior liveries that are engineered for compliance from day one. Sarah handles space optimization, strict weight-and-balance boundaries, and advanced material specification, ensuring every design passes rigorous engineering scrutiny before production.
Completion Management
Procurement • Certification Compliance
Owner Representation
Serving as the sovereign technical representative for the principal during the build phase. This involves managing complex vendor ecosystems, engineering drawing approvals, and full compliance documentation to satisfy civil aviation authorities, maintaining both schedule discipline and asset value protection.
Operational Oversight
Outfitting Supervision • Refurbishment Audit
Flight-Line Delivery
Providing rigorous technical oversight during heavy maintenance, cabin modifications, and final flight-line delivery. Sarah conducts exhaustive physical inspections, conformity checks, and systems testing to ensure the finished airframe is delivered in flawless condition and ready for immediate deployment.
DIRECT INSIGHTS ON HIGH-STAKES AIRCRAFT TRANSFORMATION.
Go behind the blueprints with Sarah Mespelt Larranaga. In this video series, she details the studio's execution strategy, the realities of heavy jet modifications, and the exact engineering precision required to protect your asset's value.
Sarah explains how the studio protects schedules and budgets through strict quality control while seamlessly integrating next-generation tech—including advanced CMS, high-speed Wi-Fi, wireless charging, and high-capacity cabin reconfigurations designed to maximize asset value.
Sarah captures the ultimate payoff of a complex build: the moment the technical heavy lifting ends and the client is left entirely speechless as their shared vision comes to life on the flight line.
Sarah discusses why Hermès remains a foundational studio reference, highlighting how their uncompromising leather quality and meticulous attention to detail set the benchmark for elite aircraft interiors.
Sarah breaks down the ROI of comprehensive modernization, demonstrating how simultaneous exterior livery redesign, interior transformations, and advanced CMS overhauls dramatically boost an airframe's market evaluation.