https://www.cnbc.com/2017/08/18/wal-mart-files-patent-for-floating-warehouse-that-could-make-deliveries-with-drones.html

Wal-Mart has applied for a U.S. patent for a warehouse in the sky, which could make deliveries to shoppers' homes by way of drones.

This could be the big-box retailer's latest move to take its e-commerce business to the next level.