I don't think this is correct. I have several flight schedule alerts currently set that are off by 5 hours. If I click on the magnifying glass icon, I get the following pop up response: The flight schedule has changed for "Your trip alert AAA-BBB". It has been like this for days now, yet I am not receiving any notification.

In other words, EF's system recognizes that there is a flight schedule change based on the alert, but NO notification is being sent. I don't know if this is still a glitch that hasn't been fixed or if they have stopped sweeping or dramatically reduced the frequency of sweeps, but here we are a week later and NO notification. IMHO and for my $99, that sorta defeats the purpose of setting an alert. YMMV.