What are the Odds?

Two of our sons chose to ride this plane in 1999. Two younger sons chose the same plane 6 years later in 2005. I just discovered it going though the photos. Maybe it’s in the genes.
You can even see the wear on the plane (The number is coming off).

What are the Odds? 2 boys, 6 years later 2 younger brothers make same choice, mom takes same photo. http://bit.ly/1j5t5w