By the Wall Street Journal, using data from FlightStats.com and the Department of Transportation.
Six criteria: late flights, cancelled flights, extreme delays, bumped passengers, lost bags and complaints.
The 2012 results:
1 Delta
2 Alaska
3 US Airways
4 Southwest
5 jetBlue
6 American
7 United
#Alaska Airlines #American Airlines #Delta Airlines #jetBlue #outhwest Airlines #United Airlines #US Airlines #US Airways