We flew back from WDW on Sunday on a 12:20 Delta Express flight from MCO to Newark, NJ. Due to horror stories of long security lines at MCO on Sunday late morning-early afternoon, we left WDW a little after 9:00 and got to the security screening area around 10:00 a.m. There was absolutely no line so we ended up sitting around the airport for more than 90 minutes before boarding.
Maybe it gets busy later in the day but based on our experience I wouldn't be too concerned about delays on Sunday mornings.
Maybe it gets busy later in the day but based on our experience I wouldn't be too concerned about delays on Sunday mornings.