''The Few'' RAF Kenley
I get why you shared the image. The occasion has special meaning to you. Add to that the fact that your son took the shot. The sky is dramatic, particularly in B&W. The unusual composition adds to the interest. The small glider in the middle of the wide open sky hits several different buttons- freedom, isolation, etc.
On the downside, the glider is a small speck in the frame when viewed on my monitor. Without your comment I would not have given it much of a look. I'm thinking it might work better as a large print. Maybe hang it lower than normal so the glider is at eye level. Enlarging it so that you can clearly see the glider in the middle of all that sky could have a strong impact.