Which Aerospace & Defense ETF Is a Better Buy: Big Bets or Broad Exposure?

iShares U.S. Aerospace & Defense ETF (ITA) is positioned as the more cost-efficient option, charging a 0.37% expense ratio vs. 0.58% for Invesco Aerospace & Defense ETF (PPA), while also showing higher trailing-12-month total return (27.2% vs. 23.3%). However, ITA is more concentrated—its top three holdings (GE Aerospace, RTX, Boeing) represent 47%+ of the portfolio—making returns more sensitive to execution risk in these primes. Both funds have similar volatility (beta 0.75) and comparable five-year drawdowns (max drawdown ~18% for both), suggesting the key trade-off is concentration vs. diversification rather than risk level.

Analysis

This is less a fee comparison than a call on concentration risk inside the U.S. defense complex. ITA is effectively a levered bet on a few large primes, so the next leg depends on whether GE Aerospace and RTX keep compounding enough to offset any Boeing slippage; PPA dilutes that single-name execution risk and is better positioned if budget flow broadens into electronics, avionics, and defense-tech content rather than just airframe and engine incumbents.

Second-order, the market is likely underpricing the difference between “defense spending up” and “primes execute.” If procurement dollars migrate toward sensors, software, and integrated systems, PPA’s modest tech sleeve becomes more valuable while ITA’s concentration can cap upside. The main near-term risk to this view is a clean Boeing turnaround plus continued margin stability at GE/RTX, which would make the concentration a feature rather than a bug.

Time horizon matters: over days, these ETFs mostly trade as sector flow vehicles; over 1-3 months, the catalyst is execution commentary and contract award headlines; over 6-18 months, the question is whether the spend mix shifts away from legacy airframes toward higher-multiple defense tech. The contrarian read is that ITA’s recent outperformance may already be pricing the “largest primes win” narrative, while PPA offers better resilience if that narrative narrows. If BA data improves materially, this relative-value setup fades quickly.

Key Decisions for Investors

• For a 1-3 month relative-value trade, go long PPA / short ITA in beta-adjusted size; the thesis is that ITA’s concentration in BA/GE/RTX leaves it more exposed to one execution miss. Falsify if BA delivers two clean quarters of production/quality improvement and ITA outperforms PPA by >3-5% on a rolling basis.
• If you want core defense exposure, prefer ITA only on pullbacks as the cheaper liquid expression of the large-prime trade; use it when you specifically want GE/RTX momentum, not broad sector diversification.
• Use BA as the cleaner short inside the basket rather than shorting the entire sector; pair long RTX or GE against BA if the goal is to isolate execution dispersion. This is the higher-conviction trade if Boeing headlines remain the primary overhang.
• For existing defense allocations, rebalance part of ITA exposure into PPA if your portfolio already owns industrials/mega-cap cyclicals; the benefit is lower single-name risk rather than higher upside.
• Watch for budget/contract award breadth and any Boeing delivery or certification inflection; if award mix broadens toward electronics and systems, PPA should outperform ITA over the next 6-18 months.