How to book online with United Cargo - United Airlines
https://media.united.com/images/Media%20Database/SDL/United/cargo/Learn/How-to-ship/Online_Booking_Guide_2020.pdf
WebRoute selection. From the list of available routes, choose the route that meets your needs by selecting the radio button to the left of the flight number, then click the select button. Once you have selected your route, the shipment details, such as pieces, weight, volume and flight details cannot be modified.
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