Leeham Company LLC, Founded in 1996
We deliver industry-leading aviation consulting services backed by decades of experience in aircraft economic analysis, airline fleet planning, and aerospace competitive intelligence.
Our Services
We provide detailed analysis and insights and technical guidance to clients across the aviation ecosystem — including lessors, airlines, OEMs, and financial institutions. We are impartial intelligence in the aviation industry, eliminating the OEM biases from our analysis.
Consulting Services
Leeham Co. delivers strategic aviation consulting across airliner operating economics, production, future programs, and concepts. We advise clients on lease structuring and returns, fleet planning, product and market strategy, production costs, and production financial planning. Our services integrate market insights with financial modeling to guide capital allocation, leasing terms, and aircraft utilization. Our goal is to enable you to make smarter, data-driven decisions.
Aircraft Modeling
Our proprietary Aircraft Performance and Cost Model (APCM) provides detailed aircraft economic analysis and performance modeling to support your purchasing decisions for aircraft for 20+ years of service. We model every type of airliner from out- of-production aircraft to alternative-energy concepts, turboprops, jets, and open-fan technologies. We have served as a “Red Team” to review programs and strategic decision-making. APCM supports production cost modeling, fleet planning, aviation demand forecasting, and asset deployment optimization.
Competitive Intelligence
Leeham Co. delivers provides aerospace intelligence to inform fleet planning, leasing, production strategy, and aircraft development. Our insights help you benchmark performance, assess competitive positioning, and anticipate market shifts in a rapidly evolving aviation landscape. We support OEMs, lessors, and operators with independent analysis to sharpen strategic advantage at every phase of the product and market lifecycle.