Southwest also didn't lay off or slash wages or benefits, so its easier to smile. (Infact they have just given out more raises even though they are likely to lose money this quarter)
At many of the majors the cuts have been draconian already (over 20 percent) leaving less people to do more, for less money, leaving them frustrated and harried. When the majors can recall everyone and everyone feels like the light at the end of a tunnel isn't an oncoming train, look for attitudes to improve.
Right now many employees are severely demoralized for good reason, and the airlines are simply trying to preserve cash untill times turn, even though it may hurt them in the short term.
Cheers
Wino