AirTran - the airline formerly known as ValuJet, which lost a DC-9 and more than 100 passengers in a 1996 accident in the Florida Everglades -- suffers a computer systems failure in June during the peak travel season, leaving it unable to process passengers' reservations for the better part of a day.

Unable to get boarding passes, AirTran passengers watch their planes take off without them. AirTran blames Accenture unit Navitaire, which provided the system, for the incident, not five months after singing Navitaire's praises in a press release announcing the renewal of its contract.