Airplane

Dr. Horn describes there being two planes. One with two parents, and that one is usually on time and gets to the destination on time. The other with only one parent, and that one doesn't always get to the destination. The one with two parents is as close 100% accuracy, which is better for the child. The child in the first plane is more likely to have less issues, and to not be inevitably screwed up. The second plane gets to the destination, but not 100% of the time,and usually leaves emotional scarring on the child, which can eventually lead to problems with children who only have one parent. Horn is basically saying that a family with two parents is easier for the child, society, and is better.