 On a clear night like tonight, you can see the aircraft with little white dots in the sky lined up coming in. And when they go out, it's literally one after another. And this is what it takes. Thousands of workers, miles of conveyor belts, one plane after another taking flight to get you that avocado slicer or weighted blanket you impulse ordered and get it to you tomorrow. In Louisville, Kentucky, I'm Kristen Schwab for Marketplace.