I was able to book BOS-FRA with SK EuroBonus in July without too much trouble. Actually BOS has quite a lot of open award space while surprisingly NYC was hard to come by. I flew Tuesday and Wednesday.
Anyhow, I had to book HAM-BOS-HAM as married segments since the individual legs HAM-FRA and FRA-BOS were not available. Didn’t matter to much as I had to fly in from CPH anyway.