Though they had all been together on the transcontinental flight for three hours, the passengers didn't start to talk to one another until the plane ran into some serious turbulence. This behavior is best explained by the

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The tendency for external threat to increase affiliation explains why the passengers started to talk to one another during turbulence. Facing a common threat or stressful situation can lead people to seek out others for comfort and support.

Though They Had All Been Together on the Transcontinental Flight