Airline drone delivers free flights to customers
— By Tyler Falk on December 9, 2013, 5:58 AM PST
Think of how many more free flights they could have if they just used the customers cell phone or other devices for notifications. Of course trained rats could deliver the messages as well and be the functional equivalent (not much) of toy helicopters - and probably get even more attention in restaurants.
If basic economic education was a requirement for SP contributors they would only have two or three and this author wouldn't be one.