Spirit named most hated airline in US. Again. April 15, 2014 Spirit Airlines has received more complaints than any other domestic carrier for five years in a row, according to a study. Spirit Airlines has received more complaints than any other domestic carrier for five years in a row, according to a study. Every year from 2009-2013, passengers were three times as likely to have an issue with Spirit than they were the second-place airline. The figures were calculated based on complaints – from flights and fares, to baggage and refunds – per 100,000 passengers. ‘As the airline has grown in the past several years, complaints against the airline have skyrocketed,’ according to the U.S. Public Interest Research Group Education Fund report.