Google

The aircraft is at 36,000 ft, heading 314.6° at 422.9 kt, and the only ALIGNED candidates (Δhdg ≤ 25°) are KNUQ (Δhdg 13°, 166 nm) and KSJC (Δhdg 14°, 160 nm). KNUQ is the home base for Google's fleet and is strongly supported by the briefing (Google's 60-year lease at Moffett). The distance is a short final leg, consistent with a return to base after a flight from the south. Past predictions show a high success rate for KSJC/KNUQ returns, and the plane is not loitering, so the BEHIND/SIDE airports are rejected.