Emergency declared on United Airlines flight after 'unruly' passenger tries to attack crew and enter cockpit

The incident occurred on United Airlines Flight 1837, which was arriving at Newark Liberty International Airport in New Jersey at 6 p.m. on Saturday.
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Delta flight makes emergency landing after pilot says passenger tried to access cockpit

Delta 257 emergency. Go ahead. Houston Houston Hobby via radar vectors maintain 6000. Turn left heading 270. 25 emergency. We had *** passenger get up and try to access the cockpit. Delta 2557, and ...