Having used something similar to this process in Iceland and Sweden, I'm glad to see that SW is adding them!
They can be a great timesaver if all you need to do is check your bag in!
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Had the "pleasure" of flying one of the competitors the other week - one of the few upsides was that the boarding pass was, indeed, on my smartphone. Scanned it at the TSA checkin coming into the terminal directly from the parking garage and then scanned again to board. Was a pleasure - too bad it isn't on all carriers and at all airports!
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