"Do they wounder why load factors are falling?"
Its average load factor over a year is around 82%, which per se is very good. To give some month-specific examples: July 2006 90% and July 2007 90%; April 2006 85% and April 2007 83%. That 2% deduction was because of an extra high capacity increase. Everything considered, it's stable and fine.
Most importantly, is its net profit is increasing; indeed, it now earns more net profit than Southwest.