Huge boomerang shape wing

I live with my mother in her mid 80s as her carer, and we have a little poodle whom each night about the same time goes out to do his business before bed and this particular night it had rained earlier and there were still bit of odd rain clouds around and as usual I've got my cigarette and looking up in the sky as I usually do waiting for my dog to finish I thought I could see something massive up amongst the clouds. But the strange thing was, if you try looking at it directly to get a better look you couldn't see it and it was extremely hard to see it already and only through the peripheral vision you could just make out what i was witnessing.
This thing was so big and I mean it was big. Let me just say I only saw one small section of a wing and what I can confidently say is this was at least few hundred metres long at least! But even more strange it didn't make a sound nothing! No vibration no lights and absolutely no sound just this huge black thing which looked like a boomerang.
Oh my God!!!
I always wanted to believe but I was little reluctant to do so without any concrete evidence personally but now I believe and nothing will change that now.