Originally Posted by Standby4321
I value miles at .015, but when you're flying a friend, there is an additional consideration that leans toward using miles: you're not giving up an miles-earning opportunity in the equation, which you would be if you were flying yourself. Verdict: In this case, you use miles to do the job.
Thanks everyone for their input. I think we're going to use miles. That's a great point above. If I can save say, $250 and use that on a trip for us, which earn US more miles than that's a plus too.