I wish they occurred more often! I, too, tend to book a handful of flights pretty far out, oftentimes an award flight that might have multiple connections (when the more convenient routing isn't available). My hope is that something changes on one of those flights letting me book the more desired route. For example, I'm have a BOG>MIA>DTW>ORD award in June. The MIA>DTW>ORD are very tight connections. I'm sure something will change with that and let me move to a direct MIA>ORD flight.