AA’s new aircraft set for 2 more routes, Boston debut soon

Just before the holidays, American Airlines debuted its brand-new, premium-heavy plane, which sports its latest-generation Flagship Suites business-class product — and a bona fide premium economy cabin. From the start, the new Airbus A321XLR is flying exclusively on American’s most premium transcontinental route between New York City’s John F. Kennedy International Airport (JFK) and Los…