May 25, 2026
Fast plane, faster skepticism
Japan's New Hypersonic Engine Could Make 2-Hour Flights to the US a Reality
2-hour Tokyo-to-LA sounds wild, but commenters say the real trip is straight to reality-check city
TLDR: Japan tested a key engine for a future ultra-fast passenger plane that could someday cut Tokyo-to-LA flights to about two hours. Commenters were split between awe and eye-rolls, with many saying the real obstacles are cost, heat, materials, and the fact that airport hassle still ruins everything.
Japan’s space agency, JAXA, just pulled off a key ground test for a future plane engine that could one day blast passengers from Tokyo to Los Angeles in around two hours. On paper, it’s the kind of story that makes you want to scream “book me a seat immediately”. In the comments, though, the vibe was less jet-set fantasy and more “absolutely not so fast.”
The biggest reaction? A giant, nerdy reality check. One camp said the headline makes this sound way closer than it really is, arguing that an engine test is not the same thing as a real passenger plane. Several commenters piled on with variations of: we don’t even have the materials, the heat is terrifying, and this is being sold like a simple upgrade when it’s really a mountain of engineering pain. Another blunt voice called it “pie-in-the-sky” and dragged the story for skipping the money, politics, pollution, and the ghost of past supersonic flight flops.
Then came the comedy. One user instantly asked the question everyone was thinking: how much is this ticket, 50 grand? Another delivered the most relatable roast in the thread, saying the only time this plane really saves is after you’ve already survived security lines, airport chaos, and all the usual travel misery. In other words: the plane may be hypersonic, but the public’s skepticism is somehow even faster.
Key Points
- •JAXA and engineers from Waseda University, the University of Tokyo, and Keio University completed a ground combustion trial of a ramjet engine for a Mach-5 aircraft.
- •The test took place at Kakuda Space Center using a wind tunnel that simulated Mach-5 flight at about 25 kilometers altitude.
- •The article says ramjets are air-breathing engines with no moving parts that require prior acceleration to supersonic speed before they can operate.
- •Engineers tested a thermal-protection system that kept the aircraft interior near normal operating temperature while measuring surface-temperature distribution under extreme heat.
- •The reported next step is a sounding-rocket flight test, and the article says commercial hypersonic passenger service is a long-term goal for the 2040s.