Adelynn Campbell's last plane trip ended with a panic attack that she got through largely with the help of a kind flight attendant.That was last year — before 67 people were killed in January when an American Airlines jet collided with a helicopter over Washington, D.C., in the deadliest U.S. air disaster in almost a quarter-century.Now, Campbell is even more hesitant to book a flight."It's definitely spiked my concern about getting on a plane, and it's making the whole situation a little more stressful than it used to be," said Campbell, 30, who manages a coffee shop in San Diego.Being at least a little nervous about flying is understandable. As Mel Brooks once said: "If God wanted us to fly, He would have given us tickets." But for some people, it causes deep anxiety that could require p...