Online Extra: The Key for Southwest: "Remain Flexible"  As its
major rivals continue to rack up record losses, Southwest
Airlines (LUV) has just finished its 30th consecutive year of
profitability. Yes, a weak economy and the aftershocks of the
terrorist attacks have hurt Southwest, too, but the low-fare
leader has proven once again that its business model works in
good times and bad.  And Southwest hasn't missed a beat since
the June, 2001, shift in leadership -- when James F. Parker
became CEO and Colleen C. Barrett became president. Of course,
legendary co-founder and Chairman Herbert D. Kelleher is still
very much a force at Southwest, as he maintains control of
schedule and fleet planning and government affairs. While the
irreverent Kelleher is keeping a much lower profile these days
and refusing most interviews, he sat down with BusinessWeek's
Dallas Bureau Chief Wendy Zellner recently to talk about his
successors and his airline. Following are are edited excerpts of
their conversation:  Q: Why was Jim