Airline stocks have been all over the map this year, but Macquarie thinks that there’s more runway ahead for both one of the best performers in the group and one of the worst. Stock in (AAL) (AAL), another so-called legacy carrier, is firmly in the red. The shares have been hurt by lackluster earnings, debt worries, and the rescheduling headaches that have come from its reliance on the grounded Boeing planes.