Amazon wants govt permission to run mystery wireless tests in rural Washington
businessinsider.com
businessinsider.com
I'd guess they are going to set up an LTE cell site with "off band" values use LTE modems/radios/antennas on their drones to co-ordinate flight. Get it all working and then go into Verizon and say "hey we'd like to piggyback on your network for our drone services, this is how much traffic, spectrum, and activity you can expect based on our test data ..."
http://www.theregister.co.uk/2011/05/02/stolen_sim_woman_jai...
Obviously the infrastructure of building a drone delivery network would be building all those towers.
You can avoid this by building a mesh network and attempting to ensure drones are always within LOS of each other.
I guess they don't have the drones flying yet b/c there is no FAA permit (unless they already acquired on).
Not sure it tells you much. They are obviously also limited to what portions of the spectrum are available.