Honeywell Split Into 3 Companies. Here's Which One I'd Buy for the Aerospace Boom.

The need to modernize commercial and defense aerospace fleets is expected to drive increased spending in the sector. One report estimates that global aerospace spending will rise from $434.17 billion this year to $846.30 billion by 2035, a compound annual growth rate of 7.7% -- and so the industry is transforming as a result.

In 2024, one key player -- then known as just plain-old Honeywell International-- announced it would split its three segments of advanced materials, automation, and aerospace into three companies. In October of 2025, it spun off its advanced materials business into Solstice Advanced Materials (NASDAQ: SOLS). Three months ago, on June 29, the company completed the spinoff of Honeywell Technologies (NASDAQ: HON) for its automation business and Honeywell Aerospace (NASDAQ: HONA) for its aerospace business.

Deciding which Honeywell company is the right one to buy for the aerospace boom may seem like a trick question. The answer is so obvious, it can't be right, can it?

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The choice isn't as simple as it seems

The name makes Honeywell Aerospace seem like the obvious stock to play the aerospace boom. The company builds aircraft engines, avionics, auxiliary power units, and other aviation systems for commercial and defense aircraft. However, the other two Honeywell companies each benefit from aerospace spending.

Solstice makes low-global-warming-potential hydrofluoroolefin solvents, which are critical for precision cleaning of sensitive flight instruments, oxygen lines, hydraulic systems, and jet turbine components. The company also makes high-purity chemicals, specialized blowing agents, and fluoropolymers used in semiconductors, radomes, thermal insulation, and circuit boards integrated into modern aircraft avionics.

Honeywell Technologies, which is what remains of Honeywell International, is a pure-play industrial automation company, but its products are critical to how aerospace equipment is manufactured, tested, and housed, including its distributed control systems, robotics, assembly line controls, and test facilities and environmental chambers.

So, the answer isn't so easy. To figure out which of these companies should thrive the most from an aerospace boom, you have to look back at the third quarter of 2025, when all three segments were under the same roof. In that quarter, Honeywell Aerospace reported 15% year-over-year sales growth, well ahead of the other two segments.

In the second quarter of this year, Honeywell Aerospace's first as an independent company, it reported sales of $4.5 billion, up 5% year over year. It also reported adjusted earnings per share of $1.87, down 32% from the same period last year, though that figure is somewhat skewed by short-term spinoff costs. It may take a while for the company to overcome those expenses, as its long-term debt increased to $15.85 billion from $4 million, reflecting financing moves related to its separation from Honeywell Technologies.

Investors have been lukewarm on the stock

Since its spinoff, the stock is down more than 18%, worse than the roughly 11% drop for Honeywell Technologiesso far this year and less than the 32% decline for Solstice stock. One reason for Honeywell Aerospace's decline is that it trimmed its full-year sales growth guidance from 7%-9% to 4%-5%.

Of the three, Solstice is predicting the most growth, 6%, at the midpoint, with Honeywell Technologiesexpecting 3% to 4% revenue growth.

The backlog is a big deal

As of the second quarter, Honeywell Aerospace had a backlog of $18.1 billion, and it continues to add to its orders. Year to date, Honeywell Aerospace has built significant commercial and defense momentum, securing an estimated $15 billion in lifetime value across a series of major new contract wins. Headlining these accomplishments is a historic deal with Indian carrier IndiGo, which selected Honeywell's flagship avionics and power systems for its massive order of 810 new Airbus A320neo family aircraft, marking the largest new-aircraft-selectable equipment win in the company's history.

In addition to major original equipment manufacturer (OEM) selections, Honeywell Aerospace continues to advance its retrofit, modification, and upgrade (RMU) growth strategy, highlighted by Aeromexico's intention to adopt its latest Surface Alerts (SURF-A) runway safety technology across its fleet of more than 100 Boeing 737NG and 737MAX aircraft. On the defense front, European OEMs have named Civitanavi Systems' ARGO 4000 inertial measurement unit as a preferred solution to integrate critical guidance capabilities into missile programs, unmanned platforms, maritime vessels, and land vehicles.

These orders provide great transparency of the company's earnings over the next couple of years. That backlog is largely tied to defense modernization programs, military avionics upgrades, and next-generation propulsion systems. The increase in defense budgets worldwide should give the company steady cash flow visibility even during broader economic pullbacks.

One of its biggest concerns is supply chain issues, but as a stand-alone company, it can focus on that issue more directly than when it was a segment of Honeywell International.

Taking the long-term view

Honeywell Aerospace, among the three Honeywell-related stocks, is best positioned to benefit from the aerospace boom. It has the most industry exposure of the three stocks, with Honeywell Technologies and Solstice having only tertiary exposure to aviation. Honeywell should also have more long-term growth, and its huge backlog of orders means it should have little difficulty paying down its debt.

Down the line, the stock could even offer a dividend or stock repurchases, making it more appetizing to investors. With more than $18.1 billion in revenue anticipated this year and a high-margin commercial aftermarket business, Honeywell Aerospace generates substantial free cash flow. This financial profile gives the board the flexibility to consider initiating a regular quarterly dividend once baseline operational and capital allocation priorities stabilize.

James Halley has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Honeywell Aerospace and Honeywell Technologies. The Motley Fool has a disclosure policy.