Matt Rivers has the latest on the FAA's rare move to issue a nationwide ground stop – triggering more than 700 flight cancellations and over 9,000 delays; Col. Steve Ganyard, Aaron Katersky and Rachel Scott have more on the sweeping ground stop, which is only the third time this order has been made since 9|11; Victor Oquendo reports on the massive tanker that collided into a docked riverboat near the Port of New Orleans on the Mississippi River, sending at least a dozen people overboard; and more on tonight’s special edition of World News Tonight with David Muir.
00:00 Intro
02:05 FAA issues rare nationwide ground stop due to "extraordinary circumstances"
07:05 How pilots are communicating amid FAA's nationwide ground stop
08:05 Officials: Preliminary info rules out cyber attack as cause of ATC communication issue
09:20 Nationwide ground stop "isn't another 9|11," DHS secretary says
10:29 Tanker slams into riverboat cruise, causing it to sink
13:46 Powerful storm brings heavy rain, snow and tornadoes to Northeast
16:43 Microsoft apologizes for global outage that impacted millions around the world
17:35 New video from University of Georgia student's fall from 8th floor of building
17:58 Suspect throws explosive device near Arizona police officer’s car
18:37 Brazen home break-in at Chris Hemsworth’s home in Australia
18:56 Lightsaber used by Darth Vader in famous "Star Wars" scene sells at auction
19:18 Some flights traveling over the Pacific allowed to take off on the West Coast
ABC World News Tonight with David Muir delivers the news that matters most. Watch to get the latest news stories and headlines from around the world.

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