Flying out of Boston in the Wintter, you often head out over the water. I have notices that sometimes there are white things down in the water - never been able to identify them. Do icebergs get this far south? I now they occasionally make it close enough to shore in Maine to see them there.
During the summer months I love the evening flights to LA, as you often pass by large thunderstorms over the plane. The combination of lightning in the clouds and the dusk sky is beautiful.