My issue with Hopper, now I know it is a Sabre limitation, has always been that I can't get predictions based upon more fine grained criteria. For instance know

My issue with Hopper, now I know it is a Sabre limitation, has always been that I can't get predictions based upon more fine grained criteria. For instance knowing that the lowest published fare for a particular departure and return date is going to rise or lower doesn't help me when I am only interested in flights that leave or return between specific times on those days. When I have used Hopper I have not found there is necessarily any strong correlation between shifts in the lowest published fare and other fares. Even if assume the other fares and the lowest published fare do track there is still an issue. Hopper doesn't/can't track or predict seat availability, so when Hopper gives me a notification that I should continue to wait because prices should fall I can't have any faith that the number of seats I require will be available when they do. This is especially a problem for me because when I fly I am usually purchasing tickets for multiple people. Given these limitations I find Hopper almost useless for my needs. I would love an app that would allow me to enter a departure date and time window, return date and time window and the number of passengers then provide feedback regarding both future price direction and seat availability. I'm not holding my breath.