If you are a customer of United States Postal Service, then you can select that which Service you would use to send or mail your mail item. There, estimated delivery time and the cost of USPS services are also given.
Customers can select the service which better suits their needs. If you want to mail your item overnight then use Priority mail service. If you select this service, then the latest times you can drop off your package and still receive overnight service will be displayed.
and if there is no time limit then use regular mail service. Different customers select the different type of services according to their requirements.
Note: Customers can save money by creating their own mailing labels and paying for the postage using Click-N-Ship.