My wife and I will be taking advantage of the 50K biz class award next month from BOS/DUB. We need positioning flights to/from BOS/PHL. There has been no coach award availability on US/AA even though the planes are empty according to seat alerts on EF. The fares to purchase at the time of day we would want to fly are too high compared to the cheaper times of the same day. (Prices vary from $60 to $192 one way). I would like to use Avios to book, or purchase a $60-90 one way. With 4 weeks to go, what are the chances of 2 award seats opening, or fares dropping on the flight times we would want? Out of 9 possible flights, the planes are 20% full at most. Some flights have only have 2-6 seats taken as of today. As an aside, last month we purchased the same BOS/PHL flights for October 2015 for $128 RT. That price was the same throughout the day regardless of which flights we chose.