While not directly applicable to this situation, I have one tangentially related data point. Once, during IRROPS, I was returning to BOI with my companion. The plan was to get a rental car and drop him off at his home en route to SLC, where I had a solo ticket waiting to take me home to the east coast. Unfortunately, the overnight (mechanical) delay meant that making it to SLC in time was unlikely if not impossible. WN let my companion fly alone (free) to Boise, and flew me to SLC. In IRROPS, it seems, all (well, most) things are possible.