Most of the US airline industry is under assault from skyrocketing fuel prices and a sluggish economy, but the message that Southwest Airlines president Colleen Barrett brought to the recent Wharton Leadership Conference was about the importance of treating employees and customers well. Innovative leaders such as Southwest chairman Herb Kelleher and smart management of non-human resources — especially Southwest’s fuel purchasing hedges that have saved the company more than $2 billion — have certainly helped the airline post profits for 35 consecutive years. But the foundation for all that, she said, has been making the satisfaction of employees and customers the highest priority.