Air Go?

This is Cailin's favorite question. Last night we went into the store. It was still bright and sunny, although the sun was setting. When we finished, it was dark outside. Cailin gets into her carseat and starts saying "aiiir go momma... air go"? This translates into Where did it go. I asked "Where did what go? what are you looking for sweetie... " She kept saying air go and pointing out the window. Finally, She said some more and was talking about the sky... she couldn't find the sky because it was dark outside. She loves looking at the clouds, at sunsets, and at the moon in the sky. She looks for airplanes, but we aren't near any airport, or in any flight paths... She looks though. Once in a while, she will see a hawk flying overhead and think it is an airplane.