thanks for the quick reply...I don't have the reciept but i do have the boarding pass...it is a korean air boarding pass however I do not see any informaiton on the fare code...there is a number on the bottom however i'm unsure of its meaning...under that number, I have noticed that sometimes it says Y and sometimes it says DL. in all cases, Delta stated that it was a Y fare on my summary page...

My current stub has DL on it...

1 difference i see in all of my boarding passes is that after the date, all of my previous tickets have the letter K after the Delta fight number or after the date. (these were credited as Y fares) however on my current stub, it has a V....not sure if it makes a difference