I flew on a nearly 20-hour flight

from New York to Sydney with Qantas Airways.

But this wasn't your ordinary long-haul trip.

There were only 50 people on board

because this was a test flight

to see how ultra-long flights affect passengers and pilots.

But is bringing a flight like this

to regular service possible?

And would customers even want to be in the air

that long without a break?

Normally if you're flying from New York to Sydney,

you'll have to stop for a layover,

which usually adds to jet lag

and takes longer than a direct flight.

So airlines have been working

towards more convenient routes.

Qantas Airways recently tested two flights:

New York City to Sydney and London to Sydney.

At nearly 19 1/2 hours long,

they each set the record for the longest passenger flight

in the world at the time.

The test flights were aboard a Boeing 787-9 Dreamliner

that only had about 40 passengers

and 10 crew members on board.

Because, technically, these planes

couldn't make the distance with a full payload.

They would've run out of fuel.

Sean Golding: We have two crews, four pilots in total.

We'll have a team A and a team B,

and we'll be swapping throughout the night

to ensure that the pilots get adequate rest.

Slotnick: Pilots gave urine samples

every four hours to test melatonin levels.

They were also outfitted with an activity monitor,

a light monitor, and an EEG headset

to monitor their alertness.

Golding: There's a whole bunch of sensors

in behind this strap here

that are measuring our brain wave activity.

Slotnick: So, obviously, this was no ordinary flight.

We were making aviation history.

Slotnick: We were flying in business-class seats,

but the Qantas team asked us

to rotate through the coach cabin

to balance out the weight on the plane.

So I tried out the coach cabin,

but obviously I preferred my business-class seat.

We've got about 18 hours and 17 minutes to go.

So it's gonna be a slightly shorter flight

than the 20 hours that was a possibility.

That's really just 'cause the winds are working with us,

the way that the captain was able to plan the flight.

We're not expecting any bad weather,

and that's gonna help us fly just a little bit faster.

If this had been a normal long-haul flight,

the plane would have stayed on New York time

throughout the flight,

which typically makes it hard to adjust

to a new time zone when you arrive.

But on this flight, the plane and its passengers

switched to Sydney time right away

as part of an experiment to minimize jet lag.

Marie Carroll: Everything about the cabin lighting,

everything about the food,

will be designed either to keep people awake

or to induce them to go to sleep.

And so we're hoping that

they're going to end up getting off the plane

and be quite comfortable in Sydney time.

Slotnick: Throughout the flight,

we had to follow a sleep schedule.

But normally passengers wouldn't have had to do this.

Right now, the cabin lights are all bright,

everybody's walking around taking pictures,

and we're really just trying to, you know,

power through and stay awake.

To keep us from falling asleep,

we were encouraged to get up and walk around.

I went and checked out the crew quarters,

where cabin crew members and pilots

can take a nap between their shifts.

Then it was time to eat.

This is the first meal.

This is the one that's a little spicier:

chocolate, chilies, peppers.

The first meal was light, spicy, and flavorful,

helping us stay wide awake.

We weren't supposed to have any alcohol

because it would make us sleepy.

After lunch, we were asked to stay awake

for the next four hours until dinner.

Some people watched movies,

and others chose to keep moving,

stretching, squatting, and even dancing.

Definitely starting to feel a bit tired.

It is 3 o'clock in the morning, New York time.

We're about to have our dinner and then after that

the whole plane is gonna go to sleep.

The flight crew came and put mattress pads

on each of the seats.

Then it was time for a heavy dinner

that would make us want to sleep.

At the touch of a button,

the business-class seats folded flat into a bed.

Then the flight attendants turned off the lights

to match Sydney's nighttime.

I passed out almost immediately and slept so hard.

In the morning, the lights were brought up slowly

with a warm glow, copying Sydney's sunrise.

Right away, we had breakfast.

And before I knew it, we were coming in on Sydney.

We landed at 7:43 a.m., 19 hours and 16 minutes

after taking off from New York.

Even after crossing 15 time zones,

I didn't feel jet lagged.

And all the other passengers I spoke to felt the same.

Qantas hasn't released the pilots' biometric data yet,

but the pilots told me they felt great after the flight.

20 hours in the air

wasn't as hard on my body as I thought it would be.

The new service flow really did help me

adjust to Sydney time a lot faster

than had I broken up the trip with a stop.

But I really think getting up and moving,

eating the right food, and sleeping on Sydney time

is what made the flight easier.

Plus, we got there a lot faster.

While I would totally take this flight again,

I'll have to wait.

Qantas says it won't actually start

regular service until 2023.

I flew it on a Boeing 787-9 Dreamliner.

However, Qantas picked the Airbus A350-1000

for the future routes.

But before Qantas starts flying,

it has to convince investors that this'll make money

and that passengers would actually wanna take this flight.

Then they have to convince regulators

that crews can work the long flight safely.

Right now, Singapore Airlines holds the record

for the longest commercial flight:

a 19-hour daily flight

from Newark, New Jersey, to Singapore.

But with its test flights through Project Sunrise,

Qantas is getting closer to flying these routes

as regular service and holding the record

for the world's longest flight.

Alan Joyce: Project Sunrise is our attempt to overcome

probably the last frontier in aviation.

And that opens up just about every destination

in the world we can fly nonstop to.

Slotnick: Shortly after my flight,

Qantas flew another successful test flight

from London to Sydney.

It came in at 19 hours and 19 minutes,

setting another record for the world's longest flight.

But Qantas' CEO said that's not what it's about.

Joyce: We're not aiming to have

the title of the world's longest flight.

For us, it's about having

the world's most convenient flights, to avoid stopovers,

and that's what we're aiming for.