U.S exchanges rent helicopter, drape banner in pursuit of Snapchat IPO

By Lauren Hirsch, Liana B. Baker and Olivia Oran SAN FRANCISCO/NEW YORK (Reuters) - This past November, Nasdaq Inc hired a helicopter to film Manhattan's skyline using Snapchat's new video-camera sunglasses and sent the aerial footage to its social media followers. The New York Stock Exchange - its arch-rival - on the same day tweeted a video shot from the floor of its exchange, showing that it too was using the social media giant's gadget. The scramble to promote Snapchat's "spectacles" is reve