lakedude
Y'all might be talking about 2 different things. One thing is where the plane was @ 8:11 which is very near the arc. The other thing is the final resting place of the plane which could be hundreds of miles away from the arc...
While I agree 100% with everything else you said, it needs to be pointed out Fuel Levels would indicate it likely touched down extremely close to the last ping. (if it were not already grounded)
The plane being in the air at 8:11 itself is already pushing what they would have been able to do (barring the extremely unlikely landing/refuel option, of course)