Ants or Flies?

Ants or Flies?

Observation - Ants or Flies? - UK and Ireland. Description: Yesterday I noticed they were everywhere on pavements. Some seemed to have wings and others didn't. About the size of flies or smaller. Anyone has any ideas?

Yesterday I noticed they were everywhere on pavements. Some seemed to have wings and others didn't. About the size of flies or smaller. Anyone has any ideas?