Not sure how relevant this is right now for the 2021 Atlas as I believe no new orders are being taken. Last month I was told that orders for 2021 Atlas were closed and orders for 2021.5 model were not yet available.
The big difference on the 2021.5 is the MIB3 system which features:
Interactive sirius 360L
usb-c ports (was previously only on the 6.5" display)
Upgraded navigation system
Enhanced voice control
Wireless app connect (carplay and android auto)
It also gets travel assist and emergency assist which the 2021 didn't have for some reason.
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