My scenario -- we won't ever learn what happened. Our military with its top secret ability uses satellite imagery gets a fix as it veers toward Indian Ocean. When they detect that it finally veers toward some major enemy city (see minimus above) our fighter jet puts it down. On 9/11 " On September 11, 2001, during the terrorist attacks on the United States, United Airlines Flight 93 crashed in a field in Stonycreek Township , 1.75 miles (2.82 km) north of the town of Shanksville. The hijackers had intended to crash the airplane in Washington, D.C. ; destroying either the Capitol or the White House . [7]" -- Wikipedia
Some theories advocate that our military put it down before it could do massive civilian damage to important populated structures on the ground. We'll never learn about the truth of that mission either.
Len