My flights generally go from EWR to a non-hub. In the non-hubs I rarely see a scanner. Big mess at MCO the other weekend where they don't have scanners. Because of weather delays three CO 757's going to EWR at adjacent gates were makeing announcements at the same time with very close actual boarding times. People got on the wrong plane and some where approaching hysterics. Some ended up missing their flight as they wonder over to the incorrect gate as I assumed they looked at the monitors incorrectly and didn't know there flight number (very few elites at MCO)