The new world's longest flight is getting an upgrade as Singapore Airlines builds back up in the US - see inside the luxurious plane

Onboard a Singapore Airlines Airbus A350-900ULR.Thomas Pallini/Insider

• Singapore Airlines is upping its three US routes to daily service, including the world's longest flight.
• New York and San Francisco flights are being upgraded to an all-premium Airbus A350-900ULR aircraft.
• The two-cabin aircraft consists solely of premium economy class and business class cabins.

Singapore Airlines is pressing forward to build back up its US route network despite a lull in international travel due to the pandemic.

January 18 saw the start of daily flights to Los Angeles, New York, and San Francisco from Singapore after only offering a skeleton service of three weekly flights to Los Angeles during the pandemic's peak. Flyers can now catch a non-stop flight to Singapore from the US any day of the week, something that wasn't possible for most of the last year.

And though Singapore Airlines is a passenger airline, it's not passengers that are driving the airline's resurgence. Rather, increased cargo demand has made this growth viable despite a drop in passengers.

The loss of international passenger flights during the pandemic has shot up demand for cargo space, and Singapore Airlines now has the only three non-stop cargo routes between the two countries.

What's good for cargo is also proving to be great for passengers as two of the three US routes now see Singapore Airlines' flagship premium plane, the Airbus A350-900ULR. The exclusive plane has fewer seats in an all-premium configuration, solely consisting of premium economy and business classes.

Read More: Singapore Airlines is betting on the US with new routes despite a COVID surge - here's why the airline is expanding now

Take a look inside.