Yes before anyone points it out this is American Airlines BUT if you read the article it says AA is the second airline and DL was the first.
I have never heard any GA announce on DL allergies board early, and never seen anyone most likely take advantage of it. (I only see wheelchairs and strollers for the most part preboard) Do you have to make some sort of arrangement with DL in advance or have people not caught on to this on DL? As I said it shocked me DL was mentioned as the first as this is the first I have heard of it.
https://www.foxnews.com/travel/ameri...to-board-early