NEW YORK – the discount airline JetBlue announced an end to its once-a-day Minneapolis-Boston trips. The route has underperformed for want of customer demand, said Joanna Geraghty, the airline’s new chief executive. By dropping MSP, as well as several other Midwest destinations, JetBue is focusing in its East Coast business, Geraghty said. The airline, founded in1998, has never returned a profit.