What Caused a Worldwide IT Outage?

First: A worldwide IT outage causes dozens of flights around the globe to be grounded this morning, with major airlines including American, Delta, and United all impacted. Also affected: banks and stock exchanges in Europe and Asia. CNN's Marc Stewart begins our coverage in Beijing. 

Plus: In a lengthy speech accepting the GOP nomination, Donald Trump called for unity as he recounted his near-death experience. Then he went off-script with political attacks and falsehoods. 

And: Sources close to President Biden say he's now considering dropping out of the race. 

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