I'm using FlightTracket Pro (FTP) as well as Flight Update Pro (FUP). Both are identical in terms of functionality. But I prefer FUP for giving weather forecast so that we can "estimate" if the flight is gonna be delayed or not (even though it's up to the airlines to decide).

not sure about MH & FireFly. But for AirAsia, it can do what you are looking for. But it does not give the delay of arrival or departure. It does not even tie to the seating you pick in the aircraft (unless american airlines).

My bet is it is fully functional for North American airlines but has limitations for local/domestic airlines. So, don't waste your bucks on these apps.