I recently needed to both change the departure date of a UAL reward ticket as well as book a second trip for a different month. Both flights were nonstops. I was unable to get the same routing on my (first) outbound, There was only a one-stop available so I wanted to book a one way nonstop award on AA for the first trip. The second trip which I needed to book I could get the non stop UAL going out but it would have had to be a connection coming back. The nonstop was seasonal and no longer offered. I asked if I could either use the nonstop outbound for my second trip or switch the entire first trip to the later date. Both answers were no - at least not without a $75/ticket change fee. After asking for a supervisor and holding for close to 10 minutes, the CSR got back to me that they would permit to change the dates and waive the fee on the alternate routing. Terrific. I then booked 2 one-way flights to make up my first trip. Would have been so much easier had I booked 2 one way reward tickets instead. I could have easily changed the outbound date and kept the original routing, no problem. That's going to be my new way of doing things. Obviously, one way awards work for some carriers like UAL and AA but do not work for others like DAL and US Air.