• Laboratory analysis has validated a consistent helium content of 7–8% at Jetstream #1 over extended flow periods of 12–18 h. Initial gas samples from Jetstream #2 indicate similar helium concentrations. • Jetstream #1 achieved significantly higher gross gas flow rates during the recent test relative to the 2024 campaign. However, the average helium concentration of 7–8% is comparable with the 2024 test range (7.9%–14.5%, with an average of 9.9%). • This is important as these results suggest th ....