Thanks Ari but all of the apps WERE obtained directly from Passbook's list of "Apps for Passbook". Each were selected in Passbook with each (United.com, REI.com, Delta.com) app showing up outside of Passbook as separate apps. I logged onto each app and only REI appeared in my Passbook. Its my understanding that Passbook is supposed to be a single location for all of the approved apps. This WASN'T the case though. United.com and Delta.com's apps did not have any selection which allowed me to activate their sites in Passbook. REI on the other hand did have an "opt in" selection.
I deleted the United & Delta apps and started the process all over again within Passbook. I scrolled down Passbook's selection of apps that they work with and again selected United & Delta. Again these apps were downloaded OUTSIDE OF PASSBOOK but do not show up inside of Passbook.
I travel abroad a lot and it would be convenient to be able to click on Passbook to see my tickets or airline changes in one place instead of clicking on to a separate United or Delta app and trying to remember my passwords ect. ect.
Any thoughts would be great Ari.