We toured United's fanciest Airbus jet yet, complete with business-class doors and a snack bar. See inside.

United Airlines’ newest Airbus jet is easily the airline’s fanciest narrowbody yet.

Adorned in a special blue-and-white livery and packed with 150 luxe new seats, the Airbus A321XLR underscores United’s continued push to court higher-paying travelers as demand for more comforts grows.

Most notably, sliding doors are now a feature in Polaris business class — an increasingly common feature in newer premium cabins and something long requested by many of United’s most valuable flyers.

Meanwhile, Premium Plus, United’s version of premium economy that sits between business and coach, has new privacy dividers.

During a tour of the jet at the Farnborough International Airshow near London last week, Peter Wolkowski, United’s director of onboard products and partnerships, told Business Insider that the middle-ground section is particularly popular. “It’s that nice buy-up from economy, where you can get more space and nicer amenities, as well as that opportunity to rest,” he said. “We are making a conscious effort to increase the size of the new Premium Plus.” Coach also got upgrades, including a self-service snack bar and “extra elbow room” seats for an added fee, a sign the airline is investing in economy, not just its highest-paying customers.

United hasn’t said where its A321XLR will fly first, but it’s expected to launch later this year and replace aging Boeing 757s, mostly flying routes across the Atlantic.

The plane can fly 11 hours nonstop.

Think far-flung destinations like northern Italy and West Africa — places that don’t have enough demand for a widebody but are too far for most other narrowbody jets.

The cabin-wide upgrades may make those long journeys more bearable.