On the other hand Linenberg placed a buy rating on Pinnacle Airlines, saying it has the least-complicated story, along with a compelling valuation.

FORBES

To accept his new position with Delta, Gorman stepped down from Pinnacle Airlines, based in Memphis, where he has served as Chairman of the board since 2003.

FORBES: Magazine Article

To accept his new position with Delta, Gorman stepped down from Pinnacle Airlines (nasdaq: PNCL - news - people ), based in Memphis, where he has served as Chairman of the board since 2003.

FORBES: Delta's Operations In New Hands

Five other airlines -- Atlantic Southeast, Comair, ExpressJet, Mesa and Pinnacle -- didn't get an overall grade because some categories couldn't be completed.

CNN: Delta one of top airlines to get an 'F' in report