Executive Summary / Key Takeaways

• Sky Harbour is establishing a unique "Home Basing" hangar network for business aircraft, addressing a significant supply shortage exacerbated by fleet growth and the increasing size of private jets.
• The company's differentiated operational model and proprietary hangar design (Sky Harbour 37) enable premium pricing, evidenced by actual revenues exceeding forecasts and significant markups on lease renewals, creating a competitive moat against traditional FBOs.
• An accelerated growth strategy targets 23 airports by the end of 2025, supported by strategic capital raises (including recent PIPE financing and planned debt issuance) and vertical integration in construction to manage scale, cost, and quality.
• Financial performance shows strong revenue growth driven by new campus openings and increasing occupancy, with the Obligated Group achieving positive operating cash flow, supporting guidance for consolidated cash flow breakeven by the end of 2025.
• Key risks include execution challenges in scaling development and construction, intense competition for scarce airport land, and potential impacts from macro factors on construction costs and borrowing, though management believes its lead and integrated approach provide increasing sustainability.

The Dawn of a New Era in Business Aviation Infrastructure

The landscape of business aviation is undergoing a profound transformation. A burgeoning global fleet, coupled with a distinct trend towards larger, more sophisticated aircraft, has created a critical imbalance: a severe shortage of suitable hangar space. Over the past fourteen years, the physical footprint of the U.S. business aviation fleet has expanded by nearly 36 million square feet, with the square footage of larger jets (those exceeding 24 feet in tail height) surging by a remarkable 102% between 2010 and 2023. This growth trajectory is expected to continue, with forecasts anticipating up to 8500 new business jet deliveries valued at over $285 billion between 2025 and 2034, predominantly comprising these larger aircraft. This surge in demand, coupled with the inherent scarcity of airport land and the near impossibility of building new airports, has created a fertile ground for innovative infrastructure solutions.

Enter Sky Harbour Group Corporation, a company strategically positioned to capitalize on this market dynamic. Operating under an umbrella partnership-C corporation (Up-C) structure with its main subsidiary, Sky Harbour LLC, the company is developing the first nationwide network of "Home Basing" hangar campuses. Unlike traditional Fixed-Base Operators (FBOs) like Signature Aviation (private) or Atlantic Aviation (private), which primarily cater to transient traffic and fuel sales, Sky Harbour focuses exclusively on providing premium, dedicated hangar space and tailored services for aircraft owners who base their jets at its facilities. This fundamental difference in business model allows Sky Harbour to offer a level of privacy, security, and operational efficiency (such as significantly faster "time to wheels up") that is distinct from the FBO model, which can experience up to 10 times more aircraft movements.

The company's journey began with securing long-term ground leases at key airports and financing initial developments through mechanisms like the Series 2021 Bonds. Early projects like SGR, BNA, and OPF Phase I laid the groundwork, but the path has not been without challenges. The discovery of design defects in early prototype hangars necessitated costly retrofits ($26-28 million) and caused delays (3-5 months) on projects like ADS, APA, and DVT. However, these experiences have informed a strategic pivot towards vertical integration and the perfection of a standardized hangar design.

Technological Edge and Operational Differentiation

At the heart of Sky Harbour's competitive strategy lies its differentiated operational model and the continuous refinement of its hangar design. The company's latest iteration, the Sky Harbour 37 prototype, is a testament to this focus on innovation. This design is engineered not just for scale and efficiency in construction but also for maximizing the utility and revenue density of the hangar space. Quantifiably, the Sky Harbour 37 is designed to comfortably accommodate approximately 70,000 square feet of aircraft within its 37,000 square feet, a significant advantage over traditional designs. The prototype also features a demisable design, offering flexibility to cater to both single-aircraft owners seeking full privacy and those willing to share space in a "semi-private" configuration, a model that has proven highly successful in driving revenue density beyond 100% occupancy in some locations.

To support the rapid rollout of this standardized design and gain greater control over the development process, Sky Harbour has made significant investments in vertical integration. The acquisition of a controlling interest in a metal building and hangar door manufacturer (RapidBuilt) and the strategic decision to bring pre-construction, design, engineering, and even general contracting functions in-house are aimed at managing costs, improving construction speed, and enhancing build quality. In-house manufacturing of pre-engineered metal buildings is projected to yield savings of $32-33 per square foot on recent projects, a tangible benefit in mitigating rising construction costs influenced by factors like steel tariffs.

This technological and operational differentiation is not merely academic; it translates directly into pricing power and market positioning. While direct quantitative financial comparisons with private FBO giants like Signature Aviation (private) and Atlantic Aviation (private) are challenging, Sky Harbour's focus on a premium, dedicated home-basing experience allows it to command rents significantly higher than the "Sky Harbour Equivalent Rent" (SHER)—a proxy for what aircraft owners currently pay at FBOs. Actual revenues on operating campuses are exceeding initial forecasts by substantial margins (e.g., 32-33% in recent periods), and empirical evidence from lease renewals and replacements shows markups averaging 20-30% over the initial lease terms, on top of annual escalators tied to CPI with a 3-4% floor. This demonstrates the market's willingness to pay a premium for Sky Harbour's unique offering and provides empirical support for the company's thesis on significant airport inflation.

Accelerating Growth and Financial Performance

Sky Harbour's strategy is now firmly focused on accelerating the pace of its network expansion. The company has revised its guidance upwards, targeting a total of 23 airports in its portfolio by the end of 2025, adding 9 new locations from the 14 held as of Q2 2024. This accelerated site acquisition pace, described by management as growing exponentially, reflects the maturation of its pipeline and improved capabilities in navigating the complex process of securing long-term ground leases, which is viewed as the deepest competitive moat.

This rapid expansion is driving significant construction activity. Three key campuses (DVT, ADS, and APA) are slated for completion and ramp-up in Q2 2025, with two more (OPF Phase 2 and ADS Phase 2) expected by Q2 2026. As of March 31, 2025, the company had 16 additional campuses in development, with expectations to continue development at least apace with 2025 in the following year.

Financially, Sky Harbour's consolidated results reflect this growth phase. For the three months ended March 31, 2025, total revenue reached $5.593 million, a substantial increase from $2.404 million in the prior-year period. Rental revenue grew by 109% to $4.461 million, driven by new campus operations (CMA, SJC) and increased occupancy. Fuel revenue saw a dramatic 326% increase to $1.132 million, primarily due to the CMA acquisition. Operating expenses increased to $12.416 million (from $7.628 million), influenced by higher ground lease expenses (including significant non-cash accruals for new leases), increased campus operating costs (personnel, utilities, etc. for new sites), and higher employee compensation. Despite an operating loss of $6.823 million (vs. $5.224 million loss), the net loss decreased significantly to $9.126 million (from $21.199 million) due to a lower unrealized loss on warrants.

Crucially, the Obligated Group (Sky Harbour Capital), which holds the initial revenue-generating assets and projects under construction, has achieved positive cash flow from operations at the project level. This trend is expected to accelerate as the DVT, ADS, and APA campuses come online, providing the scale necessary to support the company's guidance for reaching consolidated cash flow breakeven by the end of 2025. Management anticipates that the cash flow generated by the Obligated Group will amply cover debt service obligations, projecting future debt service coverage ratios of 4-5x at stabilization, significantly exceeding the original forecast of ~3x.

Capital Structure and Liquidity

Sky Harbour maintains a focus on deliberate and opportunistic capital formation to fund its ambitious growth plan. As of March 31, 2025, the company held $97.464 million in cash, restricted cash, investments, and restricted investments. The company's debt primarily consists of the Series 2021 Bonds, a permanent fixed-rate structure with capitalized interest through July 2026, providing funding for the initial projects. The Obligated Group remains in compliance with its debt covenants.

To finance the next phase of expansion beyond the initial Obligated Group projects, Sky Harbour has been actively raising capital. This included a second PIPE equity placement in Q4 2024, which raised approximately $75 million. The company is also dual-tracking options for a potential $150-175 million debt or loan facility, engaging with major financial institutions and aiming for completion in early 2026. This approach is strategic, intended to fund new projects outside the existing Obligated Group initially, thereby preserving the credit quality of the initial bond issuance and supporting the path towards seeking investment-grade ratings in 2025.

The company's target leverage for core greenfield projects remains a 70/30 debt-to-equity split. However, management anticipates that future debt issuances under the maturing Obligated Group program may achieve higher leverage ratios as the portfolio grows and demonstrates sustained cash flow generation and debt service coverage. Sky Harbour is also exploring alternative funding structures, such as potential co-investments with real estate or infrastructure funds for existing hangar acquisitions, to leverage third-party capital while maintaining exposure to the economics of these opportunities.

Risks and Competitive Landscape

While Sky Harbour's growth trajectory and differentiated model present a compelling investment thesis, several risks warrant close attention. Competition, particularly the potential for new entrants attempting to replicate the home-basing model, is viewed as the biggest concern. However, the company believes its lead is increasingly sustainable due to the significant barriers to entry, most notably the extreme difficulty and lengthy process of securing suitable airport land, which is considered the deepest moat around the business. The integrated nature of Sky Harbour's operations—spanning site acquisition, development, leasing, and operations—also presents a challenge for potential competitors to replicate effectively.

Execution risk in scaling development and construction remains pertinent. Despite efforts in vertical integration and standardization, managing the simultaneous development of numerous projects is a significant operational challenge. Past experiences with design defects and construction delays highlight the complexities involved. Macro factors such as inflation, rising interest rates, and trade policies could continue to impact construction costs and borrowing expenses, potentially affecting project economics and the pace of expansion, although the company employs strategies like national procurement and pre-purchasing to mitigate these.

Compared to large FBO networks like Signature Aviation (private) and Atlantic Aviation (private), Sky Harbour currently operates at a smaller scale, which can impact profitability margins and operating costs relative to its larger, more diversified counterparts. While Sky Harbour's operational model offers superior efficiency and service for its niche, FBOs benefit from economies of scale across extensive networks and diversified revenue streams (fuel, maintenance, transient services). Companies like Textron (TXT) and Bombardier (BBD.B), focused on aircraft manufacturing, represent a different part of the value chain but highlight the broader ecosystem of business aviation. Sky Harbour's strategic positioning is to be the premier infrastructure provider within this ecosystem, leveraging its unique model to capture premium demand that traditional FBOs may not fully address.

Conclusion

Sky Harbour is executing a high-growth strategy in a fundamentally attractive, supply-constrained market. By focusing on a differentiated "Home Basing" model supported by proprietary hangar design and increasing vertical integration, the company is positioning itself as the premier provider in business aviation infrastructure. Empirical evidence of premium pricing power and significant markups on lease renewals validates the value proposition and supports the long-term revenue growth potential.

While the company is still in a growth phase, incurring losses as it invests heavily in development, the positive operating cash flow generated by the Obligated Group and the clear path to consolidated cash flow breakeven by the end of 2025 signal increasing financial maturity. The accelerated site acquisition and development pipeline, coupled with a strategic approach to capital formation, underscore management's ambition to rapidly scale the network.

The investment thesis hinges on Sky Harbour's ability to successfully execute its ambitious development plan, maintain its competitive edge through operational excellence and technological differentiation, and continue to secure prime airport locations. While risks related to execution, competition for land, and macro economic factors persist, the company's established moats and demonstrated ability to command premium rents in a market with structural supply constraints provide a compelling narrative for long-term value creation. Investors should monitor the progress of campus completions, the ramp-up in leasing and cash flow from new sites, and the effectiveness of the vertical integration strategy in managing costs and accelerating development timelines.