Going, FlightAware, Expert Flyer and sites like these you don't book through. They only let you know when the upgrades come available, when the flight prices drop, and other info that benefits the traveler. I always book direct with the airline.
I am not as good with these apps as many are, but they are very useful and can really help improve your travel. Loyalty also pays well, may cost more at times but you make it up with other benefits.
.
