Passengers reported a slight increase in lost, damaged or delayed checked luggage — 2.83 mishandled bags for every 1,000 passengers, up 7 percent from a year ago.
Overall complaints about airline service jumped 50 percent, but the actual number, 1,300, was a tiny fraction of all air travelers. Few passengers bother to file a formal complaint with the government when things go wrong.
Southwest Airlines had the lowest complaint rate, followed by its AirTran Airways subsidiary. United had the highest rate of complaints, followed by American.