Key Points and Summary – Lockheed Martin’s SR-72 “Darkstar” aims to fly at Mach 6, pairing hypersonic reconnaissance with strike options such as the High-Speed Strike Weapon.
-But a 2025 prototype flight, as reported in the past, is doubtful.
SR-72 Son of Blackbird. Image Credit: Creative Commons.
-Lockheed has reported hundreds of millions in program losses, while the Air Force faces competing priorities—B-21 procurement, NGAD, B-52 re-engining, and F-35 upgrades.
-Technical hurdles remain, from materials that survive hypersonic heat to reliable propulsion.
-Advocates say the unmanned SR-72 would fit Pentagon moves toward drones and hypersonics; skeptics expect delays into the 2030s.
-A late-2026 reveal is possible, but budget pressure and risk make near-term rollout unlikely for the SR-72 program.
Will the SR-72 Prototype Be Unveiled This Year?
One of the most popular spy planes that ever graced the skies was the SR-71 Blackbird. This strategic reconnaissance airplane captured the public’s fascination as it blazed through the skies at greater-than-Mach-3 speeds.
But what if I told you there is a “Son of Blackbird?” The SR-72 Darkstar should be even better.
Not only is the SR-72 supposed to fly hypersonic at Mach 6, but it will also do much more than simply collect intelligence, surveillance, and reconnaissance data. The Darkstar will have a ground strike option – perhaps using hypersonic missiles.
SR-72 Darkstar Plane. Image Credit: Lockheed Martin Handout.
Can you imagine a Mach-6 aircraft blazing over targets, sending recon intel back to the home base, and then suppressing enemy air defenses to prepare follow-on strikes by the new B-21 Raider bomber? This would be a revolution in aerial warfare.
But This Program Will Probably Be Delayed
It’s going to take a while before this airplane is built in numbers. The Air Force is being highly secretive. Some online aerospace wags who keep tabs on Lockheed Martin predicted there could be a flying prototype this year, but Air Force budget realities often get in the way of ambitious programs.
The SR-72 might be an aspirational airplane that will not see active production until the 2030s. The numbers to be manufactured are not clear. However, it would not take a large fleet to transform the way the United States collects reconnaissance data and carries out ground strikes.
Lockheed Martin Is Losing Money Hand Over Fist
There was some negative news about the Darkstar program in 2024. Lockheed Martin, as a publicly traded company, must make a quarterly report to the Securities and Exchange Commission. There was a write-off of $45 million in the second quarter of FY 24.
The company has also taken a $335 million loss on Darkstar since 2022.
“We will monitor the recoverability of pre-contract costs, which could be impacted by the customer’s decision regarding future phases of the program,” Lockheed said of the SR-72, as noted by Sandboxx News.
A Leader in Hypersonic Flight
The SR-72 was announced by Lockheed in 2013.
“Hypersonic aircraft, coupled with hypersonic missiles, could penetrate denied airspace and strike at nearly any location across a continent in less than an hour. Speed is the next aviation advancement to counter emerging threats in the next several decades. The technology would be a game-changer in theater, similar to how stealth is changing the battlespace today,” Lockheed’s director of hypersonic flight Brad Leland said at the time.
After this 12-year lead, Lockheed Skunk Works could have a flying prototype by the end of this year, according to Interesting Engineering. But we have not seen one yet.
The Darkstar Fits Into Air Force Strategy
One development in the SR-72’s favor is the U.S. Air Force’s strategic commitment to hypersonic flight – and to the use of hypersonic missiles. The SR-72 will also be unmanned, thus aligning with U.S. Secretary of Defense Pete Hegseth’s preference for developing drones instead of manned airplanes.
The U.S. military is working on the High-Speed Strike Weapon (HSSW). This munition is tailor-made for the SR-72. The Son of Blackbird will have ample use cases for the HSSW as adversaries such as China, Russia, North Korea, and Iran become more belligerent and threaten U.S. national interests.
The HSSW on board an SR-72 could reach targets in Europe and East Asia in 90 to 120 minutes.
Competing Airplanes Make Resources Scarce
To make the SR-72 a reality, the Air Force must put its money where its mouth is. But budgetarily speaking, this is a fraught time for the service. The Air Force wants at least 100 B-21 Raider stealth bombers. The F-47 NGAD program needs to get off the ground, and research and development is already expensive for the fledgling project.
B-52s require new engines and radars. The F-35 is being upgraded. All of these acquisition contingencies cost substantial funds.
If Lockheed Martin is really losing money on the SR-72, it comes at a bad time – Air Force budget priorities call for difficult choices. This could mean that the Son of Blackbird will be delayed and its wings trimmed. A prototype later this year may not be possible. Plus, the technological innovations necessary for the Darkstar could prove too cumbersome. The difficult pressure and heat generated by Mach-6 flight are unknown variables. The Air Force learned much about high-speed flight with the SR-71, but the Son of Blackbird will go twice as fast if all goes according to plan.
I’m excited about the SR-72, but it seems unlikely a prototype will be finished this year. The cost and technological hurdles are high. Lockheed’s share price could suffer.
The CEO and board of directors may decide to put the brakes on the program. The Air Force has pressing needs with other new fighter jets and bombers, plus changes to legacy airplanes.
But 2026 is a new year, and that could mean greater emphasis on the SR-72. I could see a prototype coming out late next year, and that would place the program on a steady path toward active service in the early-to-mid 2030s.
The SR-72 is compelling enough to warrant the attention of Air Force brass and the Secretary of Defense, who believe that this airplane will fit U.S. strategic objectives.
About the Author: Brent M. Eastwood
Brent M. Eastwood, PhD is the author of Don’t Turn Your Back On the World: a Conservative Foreign Policy and Humans, Machines, and Data: Future Trends in Warfare plus two other books. Brent was the founder and CEO of a tech firm that predicted world events using artificial intelligence. He served as a legislative fellow for US Senator Tim Scott and advised the senator on defense and foreign policy issues. He has taught at American University, George Washington University, and George Mason University. Brent is a former US Army Infantry officer. He can be followed on X @BMEastwood.
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