United's posh new Airbus A321XLR is headed overseas: Sneak peek on board

United Airlines' newest plane will make its international debut right as the holiday season ramps up.On Dec. 1, right after Thanksgiving, the carrier's all-new Airbus A321XLRs will take off from Dulles International Airport (IAD) en route to Dublin and Amsterdam.Those flights will be the first of many to come for United — and will mark the hard launch of a plane that has been hailed for years as a potential game changer for the airline.This week, TPG got a sneak peek on board.SEAN CUDAHY/THE POINTS GUYPolaris business-class suitesThe A321XLR is a distinctive new aircraft for United because it's a single-aisle plane, but it sports many of the bells and whistles you'd normally expect to see on a large wide-body jet.Up front, instead of a traditional domestic-style first-class cabin, it's a bona fide international business class.Climbing on board, you'll find 20 of the airline's latest-generation Polaris suites, complete with lie-flat seats, sliding privacy doors and 19-inch 4K entertainment screens.SEAN CUDAHY/THE POINTS GUYBecause this is a narrow-body jet, the suites are arranged in a 1-1 configuration (one seat on each side of the aisle).United notes it specifically designed the p...