Here in Southern AZ Apple uses them all the time for accessories. THEY ARE TERRIBLE and have NEVER made a projected date once in the 4 or 5 times Apple has used them to ship to me over the last few years. Their (D-IT) website is useless.
It gets worse - on their website they list an 877 #. If you call it you will get a recorded message that says use the tracking number on the website , if you don't have one call the shipper. This repeats twice then disconnects the call!