I forgot to add we usually took the 3pm Delta flight out of SXM getting to ATL around 7ish. There were a fair amount of flights landing at that time so the lines at the kiosks were 5 or so deep. The GE kiosks were usually available.
There's no stopping at the kiosks with Mobile Passport.
It's all in your phone!
Yes, you have to wait to enter terminal before sending it, but everything else can be ready.
