In my opinion, the inflatable idea doesn't hold shape (literally)...but that's not to say it isn't a cheap knock-off/replica prop.

Notice the differences in shadows...real plane has 'normal' shadows, prop plane shadows are pure black. Doesn't look to me like the natural lighting conditions are different enough to explain the difference...but partial shadows are much more difficult/complex, much easier to just make a black-hole shadow for the fake (whether CGI or composite videos)