Camponotus pennsylvanicus (DeGeer) The black carpenter ant is a common invader of homes in the northeastern United States. In their natural habitat, carpenter ants aid in the decomposition of dead, decaying trees. They normally nest in logs, stumps, and hollow trees. However, the large, dark-colored workers often invade homes in search of food.
http://ento.psu.edu/extension/factsheets/carpenter-ants
Winged Ants May be Carpenter Ants. Seeing flying ants in your home is never a good sign, but having these winged ants in your home in the winter is especially problematic. This is because ants only fly - or even have wings - when they are getting ready to breed.
https://www.thespruce.com/indoor-flying-ants-not-good-sign-2656361
C. pennsylvanicus can be distinguished from other carpenter ant species by the dull black color of the head and body, and by whitish or yellowish hairs on the abdomen. All castes of this species (including the major and minor workers, queens, and males) are black or blackish.
https://en.wikipedia.org/wiki/Black_carpenter_ant
Carpenter ants are very common across the U.S., but are often confused with termites. Some carpenter ants are much larger than termites. In fact, carpenter ants are one of the largest of all ant species! But other carpenter ants are very small, so size is not a way to determine species.
https://www.thespruce.com/indoor-flying-ants-not-good-sign-2656361
Spotting big black ants inside your home is bad enough, but the creep factor increases when they sport wings. Flying ants likely are carpenter ants, whose breeding females use wings to travel to new nesting sites. The carpenter ants might have come inside by chance, or they could be nesting in your walls. Carpenter ants vary in size, even among the same colony, but they tend to be beefier than many other ant species.
http://animals.mom.me/giant-black-ants-wings-7597.html
Most all ants will generate “flyers”. These are usually reproductives (aka: males and females, kings and queens, etc.) with the sole purpose of leaving an existing nest to mate and start new nests. In most cases seeing 1-2 of these in the home does not mean you have a local problem.
http://www.carpenterants.com/swarming/large-flying-ants.html
Question: I keep getting large black, look like big ants, some have wings, in my bathroom. They do not look like termites. They bite. One stung or bit me on the foot. They only seem to be in the 2nd floor bathroom.
https://www.orkin.com/ask-the-orkin-man/large-black-ants-with-wings/
Carpenter Ants. 1  Workers (Fig. 1) are wingless, dark shiny brown to black in color, and 1/4 to 1/2 inch in length. 2  Winged reproductive forms (Fig. 3  The body is constricted between the thorax and the abdomen.  The antennae are 1  elbowed. The front wing of a reproductive ant is longer than the hind wing.
http://ento.psu.edu/extension/factsheets/carpenter-ants
Black carpenter ants are known to forage up to 100 yards in search of food. Workers are most active at night, traveling from their nest to a food source following trails. They do establish chemical (pheromone) trails. The ants produce crackling sounds that can often be heard near a large nest. A large colony can have thousands of individuals. The black carpenter ant does not sting, but the larger workers can administer a sharp bite, which can become further irritated by the injection of formic acid, which they produce.
https://en.wikipedia.org/wiki/Black_carpenter_ant
In early spring or late winter people often encounter these large black ants in homes. These big ants are different than the more common small, brown nuisance ants that plague kitchens. The big ants are called carpenter ants (Camponotus spp.) and unlike their smaller cousins, nest above ground in cavities. Nest building and cavity expansion by these large, powerful ants can cause damage if nests occur in our homes. Most of the ants you find in homes are small, less than 1/4, and brown.
http://livingwithbugs.blogspot.com/2009/01/what-are-these-big-black-ants-in-my.html
what are these large black flying ants?
The large black flying ants are carpenter ants. Carpenter ants are large black flying ants.