To estimate the number of drones necessary to complete all deliveries for Amazon in NYC, we need to consider several factors. These include the number of packages that need to be delivered, the distance between delivery locations, the amount of time it takes to make a delivery, and the capacity of each drone. Assuming that Amazon delivers an average of 1 million packages per day in NYC and that each drone can carry up to 5 pounds, we can estimate that at least 200,000 drones would be needed to complete all deliveries in a day. However, this assumes that each drone can make only one delivery per trip, which is not very efficient. To improve efficiency, we would need to optimize the delivery route for each drone and ensure that each drone can make multiple deliveries per trip. Additionally, we would need to consider factors such as weather conditions and air traffic control regulations. Overall, estimating the exact number of drones needed to complete all deliveries for Amazon in NYC would require a detailed analysis of the delivery process and a thorough understanding of the capabilities of the drones themselves.