JetBlue Airways Corp. ‘s shares rose 2.5% in premarket trade Thursday, after the airline topped profit and revenue estimates for the fourth quarter. The company said it had net income of $169 million, or 55 cents a share, in the fourth quarter, down from $654 million, or $2.03 a share, in the year-earlier period, when earnings were boosted by a tax benefit. Adjusted per-share earnings came to 50 cents, ahead of the FactSet consensus of 43 cents. Revenue rose to $1.97 billion from $1.76 billion, also ahead of the FactSet consensus of $1.96 billion. Revenue per available seat mile rose 2.4%, above the midpoint of guidance of up 1% to up 4%. Operating expenses per available seat mile, excluding fuel, fell 3.6%. The airline is now expecting first-quarter capacity to rise 7.5% to 9.5% and for full-year capacity to rise 5% to 7%. RASM is expected to be down 2% to up 1% in the first quarter, partly due to the calendar shift of Easter and Passover between first and second quarters. It also includes a net 0.75 point headwind stemming from a more active winter. CASM ex-fuel is expected to rise 1.5% to 3.5% for the first quarter and to be flat to up 2% for the year.