I have a couple suggestions for alerts based on how I use them, which is 99% of the time going to pick someone up at the airport (KPHX for me).
An option to send an alert when a flight is a certain distance away from the destination. If I could set this up to essentially tell me when the flight is 40nm out or so, I’d know when to leave my house perfectly pretty much every time.
An option to automatically delete the alert after the flight has landed. I often forget to go back into flightaware and delete it after I get home and then I get a bunch of text messages about the next leg of the flight etc - this can be bad late at night lol…