See inside United's first ultra-premium long-haul Airbus jet. It has sliding doors and a walk-up snack bar.

• United Airlines is set to take delivery of its first Airbus A321XLR on Wednesday.
• The specially-designed long-haul plane is expected to replace Boeing 757 routes.
• It has doors and beds in business class and a snack bar in economy.

Beds on long-haul narrow-body planes aren’t new.

United has long operated its lie-flat Polaris cabin on Boeing 757s flying across the Atlantic; so has Delta.

JetBlue Airways has similarly flown its bed-equipped Mint cabin to Europe on Airbus A321LR aircraft — the A321XLR’s predecessor.