Spirit Airlines jetliners on the tarmac at Fort Lauderdale Hollywood International Airport.
Spirit Airlines jets at Fort Lauderdale-Hollywood International Airport.
  • Spirit Airlines lowered its revenue estimate, citing a decline in non-ticket revenue.
  • That refers to things like bag fees and picking your own seat, which can cost hundreds of dollars.
  • In June, United's CEO criticized the ultra-low-cost carrier business model, saying customers "hate it."

Passengers are getting fed up with Spirit Airlines' additional fees, the carrier's latest financial filing suggests.