I don't work for DL but just using my own airline's nonrev access your chances look fair to good for DL's JFK-FRA this Saturday, April 8th. I have no way of knowing how many people have already listed. It appears that as many as 40 seats are available to sell. If you didn't get a listing locator with you pass you should call DL to ask how to list before showing up for the flight and also inquire how the flight looks.

Good luck!