Originally Posted by
RobertS975
I still can't figure out the nuts and bolts of doing what you outline above! If you already have a ticketed reservation on the alternate airline, which presumably has already been paid for, then how can DL "endorse" your other ticket over to the other carrier? The reservation you made on your own has its unique ticket number, form of payment, fare basis code etc.
The presumption that it's paid for is what's creating your disconnect. I think you might need some good status with the other airline (as I do with UA) to get them to give a res. on the promise of a write-over. The other option is to buy the ticket on the other airline that has the 24 hour canx after booking policy, if not flown, and work with them to swap your bought booking with the interline. (WARNING! NB: this will not work on USAir)