Google

The aircraft is at 43,000 ft heading 315° with only two ALIGNED candidates: KNUQ (Δhdg 10°, 213 nm) and KSJC (Δhdg 10°, 207 nm). Both are Bay Area airports, consistent with returning to home base after a flight; the briefing notes Google's home base is KNUQ and the fleet is based there. Recent history shows the aircraft often returns to KSJC after trips (e.g., from KLAS on June 3, from KFLG on May 25), and past predictions on return legs to KSJC/KNUQ had 90%+ accuracy. The brief distance (~210 nm at 454.7 kt) gives an ETA of about 28 minutes, which is a plausible final leg.