F-15EX Buy Was Just Doubled By The USAF, Which Makes Perfect Sense

Overall, the Air Force expects to see its budget increase by around a whopping 38 percent compared to fiscal 2026, to $338.8 billion. Of those funds, a significant proportion will go into procurement, driving this up by around 30 percent, although that covers all assets, and not just new fighters.

The budget also includes significant increases for weapon system sustainment and flying hours.

At the same time, the Air Force budget includes requests to retire a number of aging aircraft, something that the increased F-15EX numbers will help address.

In particular, for fiscal 2027, the Air Force wants to get rid of 20 F-15Es. These would be the oldest examples, which include the aircraft fitted with the less powerful Pratt & Whitney F100-PW-220 engines.

Of course, it remains possible that lawmakers will block such a move, although having more F-15EXs to replace these jets should make it a more acceptable proposal.

Additional F-15EXs means more capability for the Air Force.

While the F-15EX will almost certainly take on a multirole mission once it’s more established in service, the air-to-air mission is currently the priority due to the Air National Guard getting the first of these jets. These units are tasked with the homeland air sovereignty mission, which focuses on intercepting aircraft and shooting down potential barrages of cruise missiles and, now, long-range one-way attack drones. As we have outlined in the past, the F-15EX is ideal for this role, especially, and a much more reasonable proposition for this mission than a more complex fifth-generation platform:

In the homeland defense role, which is the bread and butter of the F-15C/D ANG units, the F-15EX’s payload, range, open architecture, very advanced electronic surveillance and warfare suite, and overall adaptability will be of incredible use over many decades of service. You do not need a stealth fighter to do this mission. In fact, much of what is traded in terms of reliability, performance, and sustainment cost for low observability hinders the homeland defense mission. This includes raw kinematic performance. The F-15 can get places very fast when it needs to and still has fuel left over to do something once it is there, which is critical for quick reaction alert missions.

The customer also seems very happy with the jets.

In its 2025 annual report, the Office of the Director, Operational Test & Evaluation (DOT&E) provided an absolutely glowing assessment of the F-15EX, as you can read about here.

In terms of the air-to-air mission set, the report noted:

“Against the level of threat tested, the F-15EX is operationally effective in all its air superiority roles, including defensive and offensive counter-air against surrogate fifth-generation adversary aircraft, as well as basic air-to-ground capability against the tested threats.”

The reference to the F-15EX’s effectiveness against fifth-generation threats is especially notable. While it’s unclear exactly what kinds of threats are being referred to, a fifth-generation fighter will typically have a low-observable design, advanced ‘sensor-fused’ avionics, and generally high performance, among other attributes. In fact, very much the kind of threat that the Air Force would expect to face in a potential conflict with China.

Once the F-15EX takes on more offensive missions, it becomes even more relevant, especially as an F-15E successor, including carrying outsized payloads, among them hypersonic missiles, over long distances, which would likely be critical in a conflict in the Pacific.

But even without these offensive attributes, the Eagle II offers capabilities that are unique in the Air Force.

The F-15EX can efficiently carry 12 AIM-120s today, but that number could be nearly doubled in the future. Smaller air-to-air weapons could expand the F-15EX’s air-to-air magazine depth, too. Laser-guided rockets, now established as an F-15E weapon, would be another obvious candidate to arm the F-15EX, especially for counter-drone work.

Using the F-15EX as an arsenal ship of sorts, especially when equipped with long-range missiles, in cooperation with its stealthy counterparts operating silently and forward, is a tactic, among others, we have long discussed. Equally compelling is the case for the two-seat Eagle II serving as a ‘drone controller’ for the Air Force’s forthcoming Collaborative Combat Aircraft (CCA).

Beyond all this, the F-15EX can carry a lot of payload over a long distance, to include traditional air-to-ground weapons. If the F-15EXs replace F-15Es, they will certainly have a focus on air-to-ground missions, as well.

Just as important as its capabilities and its proven airframe, the F-15EX promises to deliver a lot on the investment. The jets should provide lower operational and sustainment costs compared to both legacy and fifth-generation types, and over many decades.

In the past, Boeing told TWZ that the F-15EX has a 20,000-hour airframe service life. “This has been enabled by running a full-scale fatigue test long enough to show structure that is good beyond 20,000 hours, and structural redesigns purposely implemented by Boeing have addressed known fatigue-critical locations,” the company’s Rob Novotny explained. This is a major benefit of an extremely mature and evolved airframe. It will be able to serve for the better part of a century at common usage rates. When you amortize the unit cost over, in some cases, two and a half times the service life of most fast jets, it offers a very clear value proposition. The cost per flight hour is also well understood after decades of Eagle operations, including years of service of similar advanced variants.

The airframe life alone is key here. 20k on these! Most tactical jets are roughly around 8k then SLEP to 10k. It's not just about the cost of acquisition, that is really a smaller factor. Operational and sustainment cost and longevity are critical factors.