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Make a wish," said Indigo. Rose made a wish and then asked, "Why?" "That's what I always do. Wish on the moving ones." "Does it matter how fast they move?" "I don't think so." "Can you wish on airplanes, too?" "Oh, yes.

Hilary McKay (2004). “Indigo's Star”, p.13, Simon and Schuster
Make a wish, said Indigo. Rose made a wish and then asked, Why? That's what I always do. Wish on the moving ones. Does it matter how fast they move? I don't think so. Can you wish on airplanes, too? Oh, yes.