SOUTHWEST IS THE MOST RELIABLE AIRLINE

Southwest Airlines, the no-frills discount carrier, handily beat the competition in most of the categories we judged. JetBlue, also considered a discount airline despite its plush leather seats and individual television sets, ranked third just behind Continental Airlines. Fourth place went to AirTran, another budget carrier.

Alaska Airlines, Northwest Airlines, American Airlines and Delta Air Lines were solidly average performers. United Airlines and US Airways landed at the bottom of the list.