HEICO Corporation

FSG aftermarket parts are repeat-purchase by regulatory mandate because airlines cannot fly without airworthy certified components, but order volumes track aircraft flying hours rather than long-term contracts, leaving meaningful cyclical exposure. No disclosed backlog or multi-year retention figure anchors forward visibility beyond the strength of underlying demand.

HEICO operates in two genuinely distinct end markets: commercial aviation aftermarket (FSG, roughly 70% of net sales) and defense and space electronics (ETG, roughly 30%). Within FSG, thousands of individual part numbers across multiple aircraft platforms reduce single-SKU concentration, though both segments ultimately serve the broader aerospace sector.

HEICO's operations and primary customer base are concentrated in the United States, with ETG serving predominantly US defense programs and FSG serving major US carriers alongside select international airlines. The company's US manufacturing base and DoD dependence in ETG indicate home-country revenue likely above 60%, limiting geographic optionality.

The PMA model has inherent operating leverage: FAA certification costs are fixed per part while incremental parts sales carry high contribution margins. Gross margin held near 39-40% across FY2024-FY2025, consistent with incremental scalability. Ongoing acquisition integration costs and physical manufacturing in both segments prevent software-like margin scaling.

HEICO's parts are mission-critical under FAA airworthiness regulations, as airlines have no legal option to defer certified maintenance, creating unusually strong repeat-purchase dynamics for a transactional model. Revenue is not subscription-based or multi-year contractual, which limits predictability to flying-hour demand rather than contracted volumes.