The Airbus A350 URL has two engines instead of four, helping carriers save on fuel costs. Source: Singapore Airlines

If you're into saving time, a 19-hour flight has returned to the skies. Singapore Airlines this week restarted its non-stop flight to and from the New York City area. The 18-hour and 45 minute flight will travels about 10,000 miles from Newark Liberty International Airport to Singapore. The flight has once again become the world's longest and shaves several hours off the trip, which currently requires a roughly two-hour refueling stop. The airline, known for its luxurious suites and service, launched the route in 2004 but called it off in 2013, after oil prices surged. A lot has changed since then — aircraft, fuel prices, and on-board creature comforts. Here's what to expect on board if you take the leap:

Out with four engines, in with two

A Singapore Airlines Airbus A340-500 Source: Airbus

Singapore Airlines operates the route on an Airbus A350-900 ULR, which stands for ultra-long range, a variety of the double-aisle jet that carries more fuel than the standard version and has a higher maximum take-off weight to accommodate the extra haul. Singapore used to fly this route on an Airbus A340-500, a four-engine plane. Airbus said the fuel savings from the new jet are in the "double-digit" percentages.

So long, seats of the past

The configuration of the Airbus A340 that the airline first used to fly from Newark to Singapore. Source: Singapore Airlines

When Singapore Airlines first launched the flight it offered a two-class cabin with seats for business class and executive coach. In 2008, it switched to an all business class configuration.

The executive economy seats used to look like this:

A Singapore Airlines Airbus A340-500 Source: Airbus

while business class looked like this when the service launched:

A business class 'space bed' is shown on a Singapore airlines non-stop passenger flight. Getty Images

Premium economy will now look like this:

The flight will feature the airline's premium economy seats, which offer more legroom than regular coach class. Source: Singapore Airlines

The new cabin features new premium economy seats, with more than 13-inch monitors and 38 inches of legroom instead of 37.

More lighting options and jet-lag fighting measures

The long-range plane will feature Singapore's newly designed business-class seats. Source: Singapore Airlines

Airbus and Singapore are aware of the toll a flight this long can take on the human body and say the plane will be more comfortable. The plane is quieter than the four-engine plane, for one. But it is also pressurized at 6,000 feet, instead of the usual 8,000 feet, which can help ward off altitude-sickness like symptoms. Airbus has also upgraded ventilation systems to refresh air more frequently and increase humidity on board.

Bored easily? More entertainment options, bigger screens and customized dining

Singapore Airlines' new premium-economy seats will feature larger screens. Source: Singapore Airlines