They used to, until a pedestrian was killed during an accident and it occurred to them that it might not be the best idea. http://learning.blogs.nytimes.com/201

They used to, until a pedestrian was killed during an accident and it occurred to them that it might not be the best idea. http://learning.blogs.nytimes.com/2012/05/16/may-16-1977-helicopter-accident-on-top-of-pan-am-building-kills-five/ http://learning.blogs.nytimes.com/2012/05/16/may-16-1977-hel...