BIG Fly

I live in Southern Vermont. Today I was in a clothing store and as I walked out, I noticed on the window there was a large fly. You could’ve said it was a house fly except for it was 2 inches long as you can see in the pictures I tried very hard to use my finger for size comparison. My friend said it was a horse fly, which are very well may have been, but I thought horseflies had color on their body like blue or something. I’m not sure. I can’t wait to hear what it is an F factor as a horse fly how big can they get? This was huge!