Sustained airborne presence
Zephyr demonstrated a long flight. Reliable repeated missions remain unverified.
Last reviewed
What we are looking for
Is extended presence or repeated return of the identified system observed?
Where this applies
Zephyr 8 · 2022 prototype · stratospheric flight
What has been observed
- The Army reports a 64-day Zephyr 8 flight demonstration.U.S. Army APNT/Space CFT · Aug 22, 2022
- AALTO reports a longer Zephyr flight in 2025.AALTO · May 1, 2025
What limits this finding
- That Zephyr 8 campaign ended unexpectedly.U.S. Army APNT/Space CFT · Aug 22, 2022
What we still need to know
Repeatable completion and exact configurations for later flights.
What would change our view
Independent endurance records or a released termination investigation.
What would be enough to confirm it
A documented long flight or repeated returns; preserve the platform and environmental limits.
How this finding has changed
Zephyr demonstrated a long flight. Reliable repeated missions remain unverified.
Checked again; no change. Reviewed; the rating and confidence remain unchanged. No qualifying new evidence resolved this parameter’s gap.
Zephyr demonstrated a long flight. Reliable repeated missions remain unverified.
First review. Initial assessment; no previous cycle for comparison.