At the risk of spoiling the joke, just curious about how powerful the drones will have to be...

https://www.tarpsplus.com/blue-poly-tarp-sold-individually.h...

"3.5 oz. Per Square Yrd."

  You have: 3 mi 4 mi 3.5 oz/yd^2
  You want: kg
   * 3688250.3

So each drone should be able to lift about a gigagram.

(Also, this plastic doesn't have enough tensile strength to support its own weight when lifted from the corners.)