(Bloomberg Opinion) — Here’s a conversation starter ahead of Berkshire Hathaway Inc.’s annual meeting on Saturday: Warren Buffett should buy Boeing Co.The idea may sound outlandish on the surface because it rubs against Berkshire’s conservative nature. There’s also the sticking point that Buffett doesn’t do turnarounds and that he wants companies with strong leadership. Then again, Buffett likes to bet on American manufacturing, and he favors industries with moats. Check and check. Also, the upside for Boeing, if the planemaker can get its house in order, is huge.