Originally Posted by
Mega Boris
For the record, I'm doing LGA-MEM-ATL-SJC-ATL-MEM-LGA straight 12 hours of traveling. I started at LGA this morning (Sat.) at 12:45pm, I'll arrive back at LGA tomorrow at 12pm.
When I checked in for the entire trip, It was only allowing me to check in for "Trip 1", which were the flights from LGA to SJC. I could not and still can not check in from SJC back to LGA.
Also, for the record, I got upgraded on all my legs at the window except for the MEM to LGA return leg. I can't see the list because I'm not officially checked in.
Oh well.
Once you're airborne on the ATL-SJC leg, login to delta.com and you should be able to check-in for the rest of your flights. Of course, you won't get a HOOU coupon since you can't print the BPs.

But at least you should be able to check on your upgrade for MEM-LGA. And you should be able to use your GM card or one of your prior boarding passes at the gate BP scanners.