Amazon has restarted drone deliveries in two states after a months-long pause, the company confirmed.In January, Amazon halted Prime Air deliveries in College Station, Texas, and Tolleson, Arizona, the two U.S. markets where it's testing the service, as the company rolled out a software update to its drone fleet.Amazon discovered an abnormality with the drone's altitude sensor, caused by dust in the air, that could have caused its system to produce an inaccurate reading of its position relative ...