The cars flow into Los Angeles International Airport in an endless stream, and in this loosely organized chaos, for-hire vehicles self-segregate at a new pickup terminal, called LAX-it. On one side, fast-moving lanes of app-hailed cars jockey to pick up their passengers. On the other, cabs inch along the curb, waiting for a fare. “I’ve never taken a taxi,” Heather Brandon, 36, of Arizona, said moments before she was whisked away. In an Uber on a recent Sunday morning to catch a Carnival cruise. Taxis are more expensive, and the Uber app is more convenient, she said.