Shares of Southwest Airlines (LUV -2.1%) suffer on a day many airline stocks (FAA +0.7%) are...

Shares of Southwest Airlines (LUV -2.1%) suffer on a day many airline stocks (FAA +0.7%) are posting modest gains. An aviation blogger reports the firm's 88 717s picked up in the AirTran buyout are increasingly "unviable" in a high fuel cost environment, a statement reinforced by the carrier's decision to drop routes serviced exclusively by 717s.