Southwest passengers fly out of seats as jet drops 300 feet in 36 seconds in response to an alert about a nearby plane

A Southwest Airlines jet heading to Las Vegas from Southern California took a dramatic plunge shortly after takeoff Friday in response to an alert about a nearby plane, sending some passengers flying out of their seats and injuring two flight attendants.

The plane suddenly jolted shortly after takeover then felt like it was falling, said Stef Zamorano, who was flying to Las Vegas with her husband to celebrate his birthday.

In front of her, Zamorano saw a woman who wasn’t wearing her seat belt shoot up and out of her seat...