Some experiences from this morning, generally positive, at BOS:

- As many have mentioned, boarding passes issued prior to the system cutover this morning need to be reissued. The check-in agent didn't know this but, when I told her, she checked with the gate and confirmed. So if you have an old boarding pass printed yesterday, make sure you ask for a new one to be issued today.

- Computer systems really slow checking in my partner. Not sure why. We did have to have tickets reissued due to the glitches, but mine went fine and hers didn't.

- United Club can't pull up Club membership details or international connections from your domestic boarding pass. You have to show a Club card (the Club membership is still the old PMUA number but your boarding pass is the new UA number) if you are a member... and you have to show an international boarding pass if you aren't (not just the domestic flight connecting to/from it). Easy first day glitches.

- T-Mobile WiFi access supposedly still requires that Club members enter their old PMUA frequent flier number, not their new number, to access. I find the connection resets on login anyway -- ongoing T-Mobile problem there -- so I don't bother to log in with them, but may be helpful for others.

- Essentially no lines at BOS for check-in. Very quiet and very typical day. (They had pre-printed all the boarding passes for the day just in case there were issues, but they haven't had to use them.)