I think the challenge is finding space into your home airport. I just searched for ATH-ORD, both using UA and AA miles. I found business space relatively easily that was in business class all the way. However, when I added DSM, I was unable to find anything using UA miles. I did continue to find good availability using AA miles, albeit with that nasty fuel surcharge. Also, sometimes it was in coach from ATH-LHR. Or it was into IAD and out of DCA. But there are possibilities so take a look again.