GR translation: chosen for its affinity for moonlight

[Mike Jing]

P269.20-23  The plane is a battered DC-3, chosen for its affinity for
moonlight, the kind expression on its windowed face, its darkness inside
and outside. He wakes up curled among the cargo, metal darkness, engine
vibration through his bones . . .

What does "its affinity for moonlight" mean exactly?  Does it mean it often
flies at night, or something else?
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