If you haven't watched any of the VASAviaton videos in the past, check out the one they did on UA149. It includes the video and ATC traffic
Some of these recent incidents remind me of COdbaUA canceling INTL flights left and right due to a variety of mx issues in 2014 and 2015.
Consolidated "Delayed/Cancelled" International Flights (2014)
Consolidated "Delayed/Cancelled" International Flights (2015)