Why airplane boarding is inefficient — and likely to remain so

We all know airplane boarding isn't the most exciting part of a trip. But have you ever questioned why the process isn't faster? There are different boarding methods: front-to-back; back-to-front; random; unassigned seating; and window, middle, aisle (WILMA). Yet airlines aren't exactly using the methods proven most efficient. CNBC got a behind-the-scenes look in Atlanta where Southwest Airlines is prototyping new solutions to speed up the process. Will we soon see a faster boarding method?