JetBlue planes at JFK's Terminal 5 in New York.JetBlue Airways swung to a loss in the fourth quarter and forecast lower capacity this year as it scrambles to return to profitability.The New York-based airline reported a net loss of $104 million in the last three months of 2023, compared with a $24 million profit a year earlier. On a per share basis, JetBlue lost 31 cents during the fourth quarter, compared with a 7-cent profit during the year-earlier period. JetBlue said it expects 2024 capacity to be down ...