Federal authorities are investigating the crash of a World War II era plane into the Gulf of Mexico off Florida, killing a neurosurgeon pilot and his passenger. http://www.aolnews.com/nation/article/wwii-era-plane-crashes-off-florida-coast-killing-2/19386616?icid=main|main|dl1|link4|http%3A%2F%2Fwww.aolnews.com%2Fnation%2Farticle%2Fwwii-era-plane-crashes-off-florida-coast-killing-2%2F19386616 Dr. Evan Zeiger Jr., 60, was flying a single engine T-6 Texan…