Throughout the airline industry, however, passenger dissatisfaction is on the rise, PIRG found. Amon

The group examined complaints portland airport hotels made to the Department of Transportation about major U.S. airlines. Passengers of Spirit were three times as likely in 2013 to lodge a complaint than those flying on Frontier Airlines, which received the second largest number of complaints per passenger. United Airlines ( UAL , Fortune portland airport hotels 500 ) and American Airlines ( AAL ) took the third and fourth spots.
Many of the DoT complaints portland airport hotels are driven by customers not fully understanding that we offer unbundled fares that let them control how much they spend, said Maggie Espin-Christina, a spokeswoman for the airline.
A spokeswoman for Frontier Airlines, Kate O Malley, portland airport hotels attributed its elevated complaint level to a one-off event, portland airport hotels a program aimed at converting its frequent flier miles to Delta s SkyMiles. Almost 40% of last year s complaints involved the program, she said.
United Airlines, which did better in the PIRG analysis than it did the previous year, said it is investing significantly portland airport hotels to improve its services and was pleased to see the latest rankings reflect our progress.
Southwest ( LUV , Fortune portland airport hotels 500 ) had the best record, with the smallest number of complaints per passenger, PIRG said. It is also the only major carrier to allow passengers to check two bags for free.
Alaska Airlines portland airport hotels ( ALK ) , which is one of the most consistently on-time airlines, was also one of the least likely to elicit portland airport hotels complaints from its passengers. Other airlines with few complaints per passenger included Delta ( DAL , Fortune 500 ) , JetBlue ( JBLU , Fortune 500 ) and AirTran.
Throughout the airline industry, however, passenger dissatisfaction is on the rise, PIRG found. Among the top complaints: flight delays and cancellations, overbooking, lost baggage, customer service, and mishaps with reservations and ticketing.
While still prevalent, complaints about lost luggage and baggage handling are starting to decrease. PIRG attributed the decline to rising fees, which have prompted many travelers to try and avoid checking in their bags altogether.
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