2 major issues with your shots Giorgio:
- the silhouette of the planes is not completely black and thus makes the shots prone for a dark rejection as they are not pure silhouette shots
- the wheels are cut off which could lead to a motive rejection
yes, "grandpa" Thierry is right. Very nice photos though...
By the way Thierry, I received a similar rejection a few time ago. The fact that not pure blacks leads to a dark rejection is very useful to know. Better include it in your great IGRR.