An object that sounds like a prop airplane

Had just come home from day out at the movies. I asked my dog to get his favorite toy. A stuff Scooby-Doo. We went outside to play a little. I heard an airplane approaching. It was a sound of a propeller airplane. The sound a single engine prop airplane. I was looking at the northwestern when I saw it flying west and close enough but still out of sight to see if its an airplane. The airplane looked white or that was what my brain was thinking. I lost it in the sky here and there. I took out my cellphone and took some pictures of it and aimed the phone in the direction it was flying. I plugged my ears and unplugged them and the sound of the airplane was gone but I could still see the object going west. I kept my sights on it and it disappeared. I went back in the house and I examined the pictures. I took two good pictures of the object. The object in the first picture has a whitish triangle with three lights that make up a triangle and a dome in middle. The second picture has just the three lights with faint triangle. Both of the pictures have the object with black tips at the pointy ends of the triangle.