Originally Posted by
Piratos
I am a bit out of touch with using UG certificates. As an SE do I now need to wait 168 hours before my flight time as opposed to being able to call at 12:01 AM Eastern 7 days prior to departure?
To clarify ZORN's comments, the upgrade window is based on days, not hours - so you will be alright if you call (and you can upgrade online as well) at 12:01 AM ET.
Of note, with Canadian Airlines (eventually taken over by AC in late 1999), the upgrade temporal window used to be hours based, not days based.