Defense and Aerospace ETFs
Defense stocks earn revenue from long government contracts, but 'aerospace and defense' funds quietly mix in volatile commercial-aviation exposure. Here's how to tell them apart.
Don't have time? Here's what you need to know:
- 1Defense revenue is durable because it comes from multi-year government contracts with high barriers and few buyers.
- 2Cap-weighted funds (ITA-style) carry heavy Boeing and commercial-aviation cyclicality; equal-weighted funds (XAR-style) tilt purer.
- 3The main risk is dependence on government budgets, plus heavy concentration in a few prime contractors.
- 4At ~0.40-0.50%, defense funds overlap with industrials like XLI; use them as a modest satellite tilt, not a core.
Why Defense Attracts Long-Term Investors
Defense is unusual among thematic plays because its revenue is genuinely durable. Prime contractors like Lockheed Martin, RTX (Raytheon), Northrop Grumman, and General Dynamics work on multi-year, often multi-decade government programs with high barriers to entry and a small set of buyers. That makes their cash flows steadier and less economically cyclical than most sectors.
Elevated geopolitical tension and rising defense budgets across the U.S., Europe, and Asia have renewed interest in the theme. The appeal is a business model with sticky, government-backed demand. But the label on the fund matters enormously, because 'aerospace and defense' can mean something quite different from pure defense.
The Defense-vs-Aerospace Distinction That Changes Everything
Many popular funds blend defense with commercial aerospace, and the two have very different risk profiles. A market-cap-weighted aerospace-and-defense fund such as the one tracked under ITA leans heavily on the largest names, which include Boeing — a company whose commercial-jet business is cyclical and has been dogged by production and safety problems. An equal-weighted fund like the one under XAR spreads weight more evenly across smaller pure-play defense and parts makers.
Commercial aviation rises and falls with air travel and airline orders, the opposite of defense's steady government demand. During the 2020 travel collapse, aerospace-heavy funds fell far more than pure defense would have. So the choice between a cap-weighted blend and an equal-weighted or pure-defense fund is really a choice about how much commercial-aviation cyclicality you want.
| Approach | Weighting | Tilt | Commercial-aviation risk |
|---|---|---|---|
| Cap-weighted A&D (ITA-style) | Market cap | Mega-cap, includes Boeing | Higher |
| Equal-weighted A&D (XAR-style) | Equal | Smaller pure-play names | Moderate |
| Pure-play defense | Varies | Contractors only | Lower |
Important: A cap-weighted 'aerospace and defense' fund can carry heavy Boeing and commercial-jet exposure — cyclical risk that pure defense does not have.
The Risks People Overlook
Defense's strength — dependence on government budgets — is also its main risk. Spending priorities shift with elections, budget caps, and the end of conflicts; a major drawdown in military spending would hit the whole sector. The industry also carries headline and political risk, and faces ESG screens that exclude weapons makers, which can limit demand from some large investors.
Concentration is another factor. Defense is a small club: a handful of prime contractors dominate, so these funds are top-heavy and a problem at one or two firms (a lost program, a cost overrun, a grounded aircraft) moves the fund meaningfully. The steady-revenue story is real, but it is not the same as low risk.
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Fitting Defense into a Portfolio
Defense and aerospace ETFs generally charge in the 0.40% to 0.50% range. Because the sector overlaps with broad industrials, some of this exposure already sits inside a fund like XLI or the total market. A dedicated defense fund makes sense as a satellite tilt for investors who specifically want to overweight the theme and are comfortable with its budget and concentration risks.
Before buying, decide whether you want the commercial-aviation exposure baked into cap-weighted blends or prefer a purer defense tilt, then match the fund to that choice. Keep it a modest slice of the portfolio; even durable-revenue sectors should not become the core. For broad cyclical exposure, an industrials-style sector allocation via XLI is the cheaper, more diversified route.
Tip: Choose your fund by weighting scheme: cap-weighted for mega-cap and aviation exposure, equal-weighted for a broader, purer defense tilt.
Frequently Asked Questions
What's the difference between ITA and XAR?
Both cover aerospace and defense, but ITA is market-cap-weighted, so it leans on the largest names including Boeing and its cyclical commercial-jet business. XAR is equal-weighted, spreading weight more evenly across smaller, often purer-play defense and parts makers. The practical difference is how much commercial-aviation cyclicality you take on.
Are defense ETFs a safe, defensive investment?
Defense revenue is unusually durable because it comes from long government contracts with few competitors, but that does not make the funds low-risk. They depend on government budgets that shift with politics, they are concentrated in a handful of prime contractors, and cap-weighted versions carry cyclical commercial-aviation exposure. Treat them as a satellite tilt, not a safe haven.
Why does commercial aerospace add risk to a defense fund?
Commercial aviation rises and falls with air travel and airline orders, unlike defense's steady government demand. Cap-weighted aerospace-and-defense funds hold large positions in companies like Boeing, so during travel downturns — such as 2020 — these funds fell far more than pure defense would have. If you want only the steady-contract exposure, look for an equal-weighted or pure-play defense fund.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.