The second nuptial flight season would make a lot of sense taking in account summer heat in July-August.
Doesn't explain the absence of males though and why those princesses didn't leave/ returned to the nest? I don't see them now btw.

An update on this case It doesn't look like those queens were to fly next year. yesterday I found a wingless queen on the nest. She could have been the queen of the existing colony but I spotted her far from the main entrance. So if she was out for a walk it was a major one. But today I found anothe...

Thanks for the response! I now see three queens sitting on the nest. Still, no males
Probably those are next year queens as you say.
I was hoping to get a Camponotus outside the regular flight time:)

Hallo Kollegen, I'm visiting Liguria for vacation and interested in ants. In the garden of the house I'm staying I found a beautiful colony of Camponotus v agus. Imagine my surprise when I saw at least 7 winged queens on the nest yesterday! But no males Therefore, I have few questions: 1. Are those ...