bdaviskc - I've noticed the same thing with award flights. I had been scouring UA for weeks for flights NYC - PRG and had ultimately determined my only choice was routing involving AC. Then one night last week not only that option disappeared, but all the other options involving AC disappeared as well, not only from NYC but also BOS. I've tried to reconstruct it as well with no luck. If you can't reconstruct with paid flights, that's even worse. I am so bummed.