Originally Posted by
kit125
Auto check-in is fine if you know your plans are firm. If you need to make a change (like a SDC), you have to call in and have them un-check in. PMUA had an easier way to do it yourself, which today's UA does not. Just a word of caution for those unfamiliar with the auto checkin.
Safe travels.
+1
I stopped doing auto check-in because of the number of SDC's I had.
Advantages: Higher up the list on upgrades where time of check-in matters, less likely that you show up at the airport late & have your reservation cancelled (30 minutes vs after every one's boarded), and gets you an email with your BP if you can receive & print an email but not have Internet access.
Disadvatage: as referenced above.