While typical serial acquirers retain cash to reinvest into bolt-on acquisitions, TransDigm pays out massive special dividends, distributing $12.9 billion over five years, including payouts of $75 and $90 per share. By comparison, HEICO pays a negligible 0.1% regular dividend, retaining earnings to internally fund its pipeline. TransDigm's aggressive cash distributions mirror private equity dividend recaps, returning substantial capital to equity holders while keeping net leverage persistently elevated.

Unlike TransDigm, which relies on sole-source pricing power, HEICO reverse-engineers and designs replacement aircraft parts approved via the FAA's Parts Manufacturer Approval program. HEICO prices parts 30% to 50% below Original Equipment Manufacturers (OEMs). This multi-year regulatory clearance process creates a generic-drug-like moat, delivering high margins to HEICO while positioning the company as a cost-saving partner rather than an adversary to commercial airlines.

Traditional defense contractors use a "cost-plus" model, earning a percentage of total costs, which incentivizes inefficiency. Anduril sells products at a fixed price, aligning its success with saving the government and taxpayers money.

TransDigm and HEICO generate 55% to 59% of their revenue from aftermarket sales rather than original equipment. Commercial aircraft remain in active service for 30 to 50 years, requiring continuous part replacements and routine maintenance. Because parts are certified for specific airframes over their entire operational lifecycles, sole-source suppliers secure decades-long recurring revenue streams that insulate them from airline cycle volatility.

Once a TransDigm part is certified for a specific aircraft model, it cannot be substituted for the plane's entire 30-50 year lifespan. This regulatory lock-in creates hundreds of mini-monopolies, giving TransDigm immense and durable pricing power on replacement parts.

An airline can lose $15,000 to $50,000 in revenue per day from a single grounded aircraft. This makes paying a high price for a TransDigm replacement part that ensures quick return to service an economically rational decision, despite eye-watering margins for the supplier.

Investors often avoid aerospace assuming suppliers share the poor economics of airlines. In reality, engine and component makers like GE Aerospace, HEICO, and TransDigm earn robust profit margins between 18% and 27%. Extreme regulatory hurdles by bodies like the FAA require years of certification for every single part, creating immense barriers to entry and enabling suppliers to sell certified parts at massive price markups without commodity pricing pressures.

The jet engine market is not a simple free-for-all. Competition is first structured by airframers like Boeing and Airbus, who decide whether to offer a single 'sole source' engine or 'dual source' options on a new aircraft. This initial strategic decision dictates the competitive landscape before airlines ever make their choice.

Serial acquirers that scale by purchasing monopoly or sole-source suppliers eventually encounter antitrust barriers. TransDigm's $960 million acquisition of Stellant Systems was blocked by the US Department of Justice to prevent monopolization in radar systems. Because TransDigm's playbook requires acquiring proprietary, single-source suppliers to command high pricing power, stringent antitrust scrutiny directly restricts its future target universe, forcing the firm to pursue less optimal deals or accept reduced returns.