Last Oct during the CA wildfires, I had a wildfire-related delay of about 3 hours from LAX-EWR. I got multiple text messages throughout the day apprising me of the status - in addition to one that advised me I would receive 500 miles as a result of the delay.

Interestingly, it booked as a "Trip Alert Bonus", so I don't know if I would have gotten the delay miles withought having signed up for Trip Alert.