Below is an example of Amazon Delivery Station's dispatch model. Dispatch means the delivery vehicles are leaving the station with certain number of packages on it and go out in a pre-defined route sequence to deliver packages to customer's door step. There are two major delivering windows everyday and they are supported by different shifts of associates. Every window has a number of waves for dispatch. Per wave, the number of delivery vans is constant. Every wave is placed at least 30 mins apart for the ease of operation. For example, wave 1 leaves at 8:00; wave 2 leaves at 8:30; wave 3 leaves at 9:00