Here is some useful information courtesy of Clancy Bros Pest Control:

Most termite reproductives or “swarmers” begin swarming in early spring to establish new satellite colonies.

These to be “kings” and “queens” of the new colony are commonly identified incorrectly as “flying ants” and unsuspecting homeowners think the problem is resolved when they stop coming out.

Subterranean termites have several feeding sites within a 300 ft radius of the nest and use pheromone trails to communicate to other termites where food and water sources are located.