According to Market Metrix via Bloomberg: (Aug 22,2007)

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                         Customer     Very Likely  Loyalty Prog.   Reported
Airline                Satisfaction    to Return     Strength        Price
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Average                    76.1           63%           14%          $318
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Midwest Airlines           85.4           76%           14%          $267
Hawaiian                    85.3           75%           24%          $391
Jet Blue                     85.3           80%            8%          $250
Frontier                     80.2           67%            8%          $292
Southwest                 78.9           80%           14%          $231
Spirit Airlines              78.5           69%           10%          $210
AirTran                     76.9           68%            8%          $233
Alaska Airlines            74.7           75%           20%          $345
Continental Airlines     73.6           61%           19%          $413
Delta Air Lines            72.4           53%           17%          $392
America West             71.5           41%            9%          $357
Northwest Airlines        70.5           54%           18%          $381
American Airlines         70.3           51%           17%          $369
United                       69.8           47%           20%          $402
US Airways             68.7           42%           15%          $367
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SOURCE: Market Metrix