I like traveling in Premium Economy class around the world due to the comfort it offers and the mileage accrual. Airlines tend to be really inconstant in PE with having a dedicated lavatory or sharing with regular economy class. I like to avoid traveling in a PE that has to share lavatories with economy class as I think sharing the lavatory with regular economy makes PE not worth the extra money spent. Does Japan Airlines (Boeing 777-300ER), Singapore Airlines (Boeing 777-300ER), Emirates (Airbus A380), Virgin Atlantic (Boeing 787-9), Cathay Pacific (Boeing 777-300ER), EVA Air (Boeing 777-300ER), All Nippon Airways (Boeing 777-300ER), Qantas (Boeing 787-9), British Airways (Boeing 777-300ER), and Air France (Boeing 777-300ER) have dedicated premium economy lavatories?

Check out the website SeatGuru. Look at each individual airline, then the type of plane you've mentioned. You'll see the physical layout of the plane and where the restrooms are. For example, Singapore does not have what you're looking for in Premium Economy.

Keep a couple of things in mind: If there is physically a dedicated PE restroom, will the cabin crew enforce the exclusivity? Maybe. Maybe not. Plus, there's always the risk of a last-minute change in aircraft type.

SeatGuru

I have recently flown UA on a 767 in Premium Plus, and Swiss Int'l on a 777 in Premium Economy and neither had dedicated bathrooms.

Spouse often flys Premium Economy on Singapore Airlines on an Airbus, and it doesn't either.

There may be some but IME on most airlines the only restrooms that have restricted use are in Business and/or First class. Most that I've flown - anyone in any coach/economy cabin can use the any restrooms in those cabins.

I think it would be more useful for the OP to indicate which if any airline that they have ever flown had such a dedicated PE restroom. I won't be holding my breath.

We flew ANA PE last year and we used Economy bathrooms from SFO to HND and HND to BKk

Perhaps that's the whole point.

I'm doing some mental math here. Let's say the trans Pacific flight is 12 hours, of which how much time will one spend in the lav? Maybe 10 minutes max, out of a total of 720 minutes...... Unless you're the type that like to hang out in the lav and read the newspaper, maybe its more like 20min....

10 min is 1.3% of the total flight time....

I don't quite get how needing to use a lav shared with the rest of coach, for a total of 1-2% of the flight time negates the added benefits of PE the other 98-99% of the time.

What am I missing?

Well, fewer people, less time standing in line.

I get that, but according to the OP it's not worth the extra money if the bathrooms are shared with economy. We all have our own priorities, but for me, the value of PE is in a more comfortable seat.

Fewer people = less "mess" in the bathrooms!

**Check out the website SeatGuru. **

I see the OP didn't come back, but FYI for any future readers asking about seats/amenities. Seat Guru is defunct and has been for some time. The site has not been updated (maybe for a couple of years) so nothing is accurate anymore. People in Flyertalk seem to be using Aerolopa for seating info.

https://www.aerolopa.com/

On my transatlantic flights in PE with AA, we were allowed to use the biz class lavs but only on our side of the plane. On Lufthansa PE from FRA to PHL, we had to use the coach lavs BUT there were lavs right behind the PE section as well as at the back of coach.