Looks to me like you airplane skeleton is obscuring your light sources.

A few things:

Move your light sources a lot farther away from the origin.   Just multiply the
locations you have by 10 and see if that helps.  If the light sources are being
overlapped by the object, then you can what you're seeing, or even just pitch
black, even though all of the requisite scene elements are present. (*)
You can also add no_shadow to you object, or shadowless to your light source(s).

Bring your camera at least 3-4 times farther back than the min_extent y
component.

Use a sky_sphere to bounce any light that you DO have around.

If still struggling, add a finish {emission 1} to your texture and then the
object will "light itself".


(*) You can know the limits of your objects by using min_extent and max_extent
to define vectors that you can output to the #debug stream and know where your
object is.

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