In summary, the earliest days of the year where it's 70F out are typically when this ant flies. They may be found flying as late as April but that tends to be the most northern part of their range, where as groups farther south can fly as early as February. Swarms gather around trees and shrubs, but aren't picky. The same day as this video I found males swarming around telephone poles and even specimen trees in my back yard. Forests tend to be abundant with swarming males which typically means more queens will show up. Queens are greatly out numbered and show up one at a time, every 5 minutes to a half hour.
Males are quick to locate them as they arrive. Once the queen has, we'll call it "tagged in," she'll try to climb up high and fly away, often a male or two will still be with her. As the day progresses wingless queens can be found wondering around looking for places to make nests, though in my experience these are harder to find than queens are arriving to the swarm to mate.