I agree it looks somewhat like a passenger jet
The "shadow" is actually from some small fluffy clouds. If this jet were flying low enough to cast a shadow that large it would be in jeopardy. That is because immediately in front of it is a mountain. This can be seen using the terrain function of Google Earth. It might be able to steer around the first foothill, but it would have to gain altitude to avoid the rest of the snow-capped mountain range ahead of it.