Here's the best way to do notifications.

Input your travel info to Trippit (free edition). Download GateGuru app, and link it to your trippit account. This will auto-populate your flights into GateGuru and the notification system in GG is FANTASTIC. I get push flight notifications for every airline in advance to their own systems updating (including the flight boards in the airport).

I'm not sure what system that taps but it's nothing short of getting a direct line to WN's flight ops center. Highly recommend and all free.