Sorry for having overlooked this picture until now, for it is very interesting. This female belongs to a very related species, if not the same, as those pictured by Beatriz Moisset in nuptial flight (October 3, 2005).
Species of this group exist in Western Europe too, and have a peculiar living cycle in that young females overwinter alone, just like Bumble-bee and Yellowjacket queens, before looking for a host-nest in spring.
This one was probably on the way to find such a colony.
These are always societies of free-living species from the neoniger group of the same genus Lasius.