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@John: Thanks, I suspected that somehow, the eyes told me fly, the antennae wasp.

@Theo: Thanks! I'll do my best and apologize in advance for my poor ecological knowledge:

Geologically there is both limestone and dolomite. Altitude about 1640m, close to the summit. Botanically mainly grassland, closely replaced by mountain pines (and larch trees) from south over west to north. In the (rather large) summit area no cattle grazing, only lots of cable-car tourists around. Plenty of umbellifers (the fly was on Heracleum, AFAIR, but other species around). I have no idea which kind of grass society it is. The fly was on a spot protected by mountain pines.

The attached picture is from today and taken some dozen metres below the fly's location. The grass looks the same, only the umbellifers were on higher places.

This picture shows the location of the fly, which was about 20m left of the windsock in the middle of the pic:
https://d2exd72xrrp1s7.cloudfront.net/www/000/1k3/jv/jvci5m4d9xi51crfc4zi7yv0x31m96qfy-uhi6830406/0?width=3072&height=2304&crop=false&q=70

And this one should be taken from roughly that spot (10-20 m behind the photographer)
https://d2exd72xrrp1s7.cloudfront.net/www/000/1k1/1e/1e8bv1wcuhrha1kq2iuvu7bln0292mvv40-uhi1291174/0?width=3072&height=2304&crop=false&q=70

Aerial image with the exact location marked see next post.

I hope this may help you.