NBC News’ Tom Costello has the latest on internal FAA documents, first reported by the New York Times, showing 77% of air traffic control facilities are understaffed, leading to mandatory overtime — and overworked, exhausted air traffic controllers. Some controllers report colleagues falling asleep on the job, or showing up to work under the influence of drugs and alcohol. » Subscribe to MSNBC: on.msnbc.com/SubscribeTomsnbc Follow MSNBC Show Blogs MaddowBlog: msnbc.com/maddowblog ReidOut Blog: msnbc.com/reidoutblog MSNBC delivers breaking news, in-depth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, The Beat with Ari Melber, Deadline: White House, The ReidOut, All In, Last Word, 11th Hour, and Alex Wagner who brings her breadth of reporting experience to MSNBC primetime. Watch “Alex Wagner Tonight” Tuesday through Friday at 9pm Eastern. Connec...