A man aboard a Delta Airlines plane attacked a flight attendant, put her in a chokehold, and threatened to “cut off her head” before slashing the woman, police said. The chaos erupted around 4 p.m. Wednesday when Flight 2432 landed at the Louis Armstrong International Airport, in New Orleans, from Atlanta, according to the Jefferson Parish Sheriff’s Office. Deputies said Nelson Montgomery, 39, pulled out a ‘”sharp object” and hurt himself with it, before the agitated man turned his attention to a nearby flight attendant. A witness on the fight said Montgomery put the woman in a chokehold and brandished...