it's a game of inches.

It's fighting for every little bit of space.

Narrator: Airplane interiors

are a battleground among airlines.

Who can make 15 hours straight in the air most comfortable,

even if you're stuck in economy?

But comfort isn't the easiest to come by

flying in a metal tube 40,000 feet in the sky.

Alice Belcher: There are challenges because you're in

a very small space with a lot of people.

Narrator: We went on board Delta's redesigned Boeing 777

with the people whose job it is

to make flying suck a little less.

Delta announced the redesign of its entire 777 fleet

back in 2018.

And the airline finished updating the 18 planes in Singapore

in early 2020.

All four cabins underwent upgrades.

Belcher: When that 777 comes in, it has a very old interior,

so they rip it all out and they install everything new.

There is thousands of hours of engineering

that has to be done to install all that equipment

and develop the interface diagrams,

develop the certification documentation.

Narrator: While Delta has announced

it will retire the Boeing 777 fleet,

its facelift can still give us a look

into how designers maximize limited space on a plane.

This is Ashley.

Ashley identifies what frustrates customers on board

and comes up with possible solutions.

Garris: So, in product development,

we have thought about every single inch of this aircraft,

from the business-class cabin

to the size of the closets

to the size of the lavatories.

Narrator: Then engineers like Alice

figure out how to bring those ideas to life

from this fancy lab in Atlanta.

Belcher: What we're trying to do is figure out,

can we take that technologies,

and is it ready to be on an airplane with 281 passengers

at 30,000 feet flying 400 miles an hour?

And then if it is, what we do is we wanna execute it

as flawlessly as we possibly can.

Narrator: So, what changes did designers make?

We'll start with business class.

Garris: This whole seat has memory-foam cushioning in it.

It's designed to be like a mattress, basically.

For us, it's all about picking very careful,

sustainable, nonflammable materials,

but also making sure they're comfortable as well.

We also have all of our controls for the seat here.

What we really work on is also building spatial mock-ups

to really determine that every passenger of all sizes

is comfortable in this space here.

And if not, then we'll work to adjust.

Can we adjust the console size to make it smaller or bigger

and give more room here?

Every suite also has a fully enclosed door.

And if you're in the center seats,

then you also have a privacy divider between the two seats.

Every seat has a leg rest, footrest,

got a remote control,

got my nice 13.3-inch high-definition IFE screen.

Narrator: That in-flight-entertainment system

is wireless, the first of its kind in the industry.

It was developed in that fancy lab.

Belcher: This is our IFE lab.

What we've done with wireless seat-back IFE,

we eliminate the ethernet cable,

and by eliminating all those cables

that are running all over the airplane,

we save about a pound per seat.

That's about 281 pounds per aircraft.

Basically equates to 1,330 metric tons

of carbon-emission savings per year.

Narrator: Alice partnered with the

Georgia Tech Research Institute

to create a software system in the IFE

that could easily be updated with new technology.

Belcher: We can't set a whole airplane fleet

down every two years and redo it all,

so we have to think very innovatively.

It also has to last a long time.

These displays on an A220,

that thing flies eight to 12 hours a day, maybe more.

It could possibly be on almost that whole time.

We worry a lot about reliability as well.

Narrator: Back in Premium Select, beyond the TV,

there's also plugs and USB ports,

and a couple other tricks

to designing within this small space.

Garris: So, every seat also has a very large tray table.

These seats are so far apart that

to put a tray table here,

I mean, you would really be reaching.

So we put the tray table in the arm.

The back of the seat's also grooved out

to still give you those extra inches there

in your knee space.

This is Delta's Comfort Plus cabin.

We do want to create that open, airy cabin.

Part of that also is just the way

that the bins are designed, right?

So, they're still high enough up

that you have lots of space and headroom.

But they're big enough to be functional,

to hold all of our passengers' bags

they're bringing on board.

All of our passengers usually really care about storage.

Probably fits maybe six roller boards.

But if I put six roller boards in here,

I'm not gonna be able to close it.

Belcher: Delta came to us and said,

"Hey, we have this problem.

We spend a lot of money on back injuries

to flight attendants.

Can you guys think of some way to fix it?"

And so we were given the challenge

to say is there a easier, better way

to be able to push up these bins?

We partnered with a supplier in Germany

to come up with this electromechanical device.

Garris: The bin lift assist will actually click on

when this weight reaches 45 pounds,

and it will make the close force

like I'm closing a bin with only 35 pounds inside.

Narrator: Engineers also had to make the bins durable.

Garris: These bins are probably used, you know,

500 times a year by all our passengers,

so that means, just, they take a beating.

We have to really be careful about the materials

that we put on board to make sure that

they're reliable and robust and not breaking.

This is really where we spend the most time.

I think the hardest part of an economy seat is the inches.

So, the industry standard on a 777 aircraft

is actually to put 10 seats wide.

Instead of squeezing in a tenth seat in each row,

we maintain nine.

Everyone hates getting that middle seat

on a long-haul flight, so instead of having

two middle seats here in the center, we only have one.

It's also about giving passengers things to do

at their seats while they're on such a long flight.

In the event that the passenger in front of me

wants to sleep and they recline their seat,

then my screen here tilts

so that I can get a better viewing angle

regardless of what the passenger in front of me is doing.

Narrator: But the design details

extend beyond just the seats

and into the whole plane.

They added more space in front of the lavatories

for people to line up.

Garris: Making sure the aisles are wide enough

so that customers can easily get their bags up and down.

Flight attendants can also easily

push the carts up and down.

Narrator: They also tweaked the lighting system.

Garris: Our full-spectrum LED lighting

has seven different lighting scenarios.

So, for your meal setting,

you're gonna have a nice, warm orange-red color

that is supposed to stimulate hunger.

We also have a sunset setting,

which is a couple minutes of transition,

which actually replicates a sunset on board,

and then it takes you to night mode.

As a designer, I've sat in these seats,

I've flown all over the world.

I wanna know what the experience is like,

and I want to know the customer pain points,

mainly because I've experienced them,

but it's also my job to try to ease those pain points.

Narrator: But making any changes to a fleet,

big or small, takes years.

Garris: We haven't even talked about certification yet.

Every single seat that you sit in

has been thoroughly tested to withstand an accident,

if that were to ever happen.

Every single piece on here

is built with all of those certifications

and testing before it ever goes on board.

Narrator: Ashley said the 777 redesign took 3 1/2 years.

Garris: And I would say at least 20 different teams at Delta

all working together.

Belcher: We came and we tested it.

We had some flight attendants come in and try it out.

We did the certification and the installation

and all the engineering so we could put it on the airplane,

make sure it was safe, and flew it away.