Corning

The aircraft is heading 298.84° and KELM is at bearing 299° with Δhdg 0°, perfectly aligned and only 103 nm away. This is the home base of Corning Inc, and recent flights show many short hops returning to KELM. The plane is at 18425 ft and 338 kt, consistent with a final descent into Elmira. While KSFO and KSEA are also aligned, they are 2000+ nm away with no immediate reason for such a long leg; the short distance to KELM is the strongest signal.