Thanks for your replies, incognitoMD, guv1976 and JDiver.....now my only issue is what's a PNR.....I'm sure it's something very easy....but I don't know it.....
I guess I was concerned as a couple of years back after I found out that a one-way ff ticket was allowable I thought, oh, I have enough miles for one way so I'll get an one-way ff ticket and come back on a paid ticket - well, when I priced it the one-way paid ticket would have been more than two rt tickets.....so I couldn't believe that it was so easy with miles.
Thanks again for your patience.