The reflection on the plane looks like the black SUVs that can be seen parked there from the opposite angle (other side of plane). When you see the crowd from that other angle, it becomes clear that they are quite a ways further from the plane than they appear in this photo from the hangar angle. So, the SUVs are blocking the reflection of the crowd in the engine paint. While true that this crowd is significantly smaller than this angle makes it appear, it does appear to me like they are real. I have no doubt that many of them are recruited and paid to be there, but still, Trump shouldn't be falling for this.