Rocket Lab’s recent earnings update clarified that first-stage tank production targets pad delivery in Q4 2026 rather than a completed launch, narrowing the window for a year-end flight amid ongoing qualification testing. A January 2026 tank rupture already slipped prior targets from early 2026 to late in the year, and the vehicle still requires integrated avionics checks, wet dress rehearsals, and a full static fire of its nine Archimedes engines before any attempt. Traders see strong precedent for further slips given typical medium-lift development timelines and the company’s explicit acknowledgment of 2027 risks. A surprise December launch would demand flawless execution of remaining milestones in just a few months, an outcome viewed as improbable given the compressed schedule.