The Air Shipping Document (ASD) is a three-part form used to ship air packages. The ASD contains your address label, tracking label, and shipping record. It allows you to choose between several payment options, including a bank check, major payment card (for example a debit or credit card, where applicable), or a UPS-issued billing information number. A red ASD is used for UPS Next Day Air shipments and UPS Worldwide Express shipments. A blue ASD is used for UPS 2nd Day Air shipments.