I have a short-notice travel need, and I'm feeling overwhelmed trying to get all of the moving pieces in place. I'm hoping some of you generous folks might be willing to help me settle on some award ticket options. Goal: BOS-PRG. C/F would be nice but not strictly necessary. I have: UA and AA miles in abundance. Chase UR. BA Avios that can be augmented with Chase UR. I am UA/star gold. Specific help I'm looking for: is there anything useful using AA miles (especially return options)? Is there anything useful using Avios? (e.g. Aer Lingus to DUB, and connect somehow from there). And, if I use UA, should I book RT now with less-than-ideal return options just to get a free domestic one-way for use later (free stopover) and save a second-close in ticketing fee, or just wait for better options to possibly open up later?