Watch the video. It looks like the Delta flight was cleared to take off as the American flight was landing. It's hard to tell how far apart they were horizontally, but it was so close the planes lost sight of each other and passengers in one of the planes heard a "whoosh" sound.
abc7ny.com
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FAA investigating 2 planes appearing too close to one another near Syracuse airport
Video shows the Delta Connection flight was taking off while the American Eagle flight was about to land at Syracuse Hancock Airport.