Entertainment lawyer Thomas R. Leavens is not a pilot. But one of his clients views him that way.“I look at lawyers like I look at pilots of jet airlines that I am boarding,” said writer Jay Bonansinga.When he boards a plane, he glances into the cockpit, hoping to see a pilot “graying at the temples, handsome … with gravitas.”“That’s Tom Leavens,” he said. “He’s the kind of guy I want flying my plane.”That’s because Leavens has negotiated several …