Originally Posted by
mudpuppy
Domestic layovers are limited to 4 hours or the next available flight, whichever is shorter. That is why delta.com won't show it to you. Domestic award tickets do allow stopovers on a valid routing but I don't know if they'll let you change your tickets to include a stopover because of a schedule change. Others here have a lot of experience changing award tickets so hopefully some of them will chime in.
Thanks -- that's what I was thinking. Then I also looked and found that International permits 24hours. This particular journey is from Canada to the US, though I think that the rules for Canada might still be 4.
Is there some way to get the fare rules for a ticket? The receipt doesn't seem to show them.