A 777 weighs 200 tons. That much weight is not supposed to land anywhere except reinforced runways. It can land on unsealed runways, but it's unlikely the plane will be able to take off again afterwards as the wheels will dig right into the ground and likely rip off the gear entirely. A couple of guys will not be able to fix up a 60 year old runway, repair the landing gear on a plane and refuel it all by themselves without being noticed. Your insistence on these theories is silly, because the rough route of the plane is known.
As for the A-10, it's an expensive old plane that is quickly coming to the end of its service life. It found a niche in the CAS role, but in a real war it would be almost entirely useless.