"I know it belongs to Berkshire Hathaway Group, but BH is not that a big and succesful mother company because it is throwing money out of the window ?"
I think SpainFly meant to say that BH didn't get to be a big and successful mother company by throwing money out of the window. In otherwords, if NJE at some point in the future started bleeding cash, BH wouldn't wouldn't continue to support the business model.
Personally, I think BH have done their homework and have a fine product and will continue to be successful. As mentioned before, aviation has turbulence! I think NJ can safely navigate most of the turbulence, but some will feel the bumps more than others!
Cheers!