Personally I like this notation style:

HND-xSIN-HKG-PER-xMEL-xBNE-xSYD-xLAX-JFK-xDFW-LHR-xDOH-NRT

So lots of transits, Australia looks especially painful. Looks valid to me but with plenty you could tweak/add.

Only 12 segments. 2 in asia, one stopover, so you can add there if you want. Only 1 in "Europe" and NA so ditto. 3 in Australia so harder to add there. .

not sure what you're looking for and so if there's scope to improve but i believe this works too fwiw:

HND-xSIN-HKG-PER-xMEL-xBNE-xSYD-xLAX-JFK-xDFW-LHR-DOH-LHR-MAD-xHKG-BKK-NRT

... any of the transits can be made a stopover except in asia.

I'm going a little ouch at posting an itinerary that stops in LHR twice given what it does to taxes. Just indicative not a suggestion given we know little about personal goals or constraints.

Thanks! Mostly just happy to double check that it breaks no rules.
So I can add LHR-MAN-LHR safely?

that would be the only addition I’d really need.

In the past, weren't there two or three cities globally where different airports were considered co-terminus, so arriving at one and departing from the other didn't burn a segment? Yes, I know, I'm showing my age here . . . .

I believe this was the case but went away with the introduction of mandatory e-ticketing.

I had a paper ticketed DONE where the routing was ORD-LON-DBV being two of the (then) twenty segments which was was actually ORD-LHR,LGW-DBV. These days it may be considered three segments.

Can a RTW originating in OSL terminate in DOH ? OR if it has to stay in Europe, can it terminate in ZRH ?

Time you downloaded the rules from https://www.oneworld.com/round-the-world
OW Explorer https://assets.ctfassets.net/m9ph4qv..._01Apr2025.pdf
Global Explorer https://assets.ctfassets.net/m9ph4qv..._01Apr2025.pdf
Circle Pacific https://assets.ctfassets.net/m9ph4qv..._01Apr2025.pdf

OW 3015 rule 4

Great, I thought I was going mad. I knew it used to be a rule at some point!

Either way it's not a massive issue.
Thanks all.

There's another approach that I like better:

HND-sin-HKG-PER-mel-bne-syd-lax-JFK-dfw-LHR-doh-NRT

That is, stops in ALL CAPS and transits in lower case. Why? you ask.

The very first thing I do whenever anyone asks for help with an itinerary is to copy their routing and paste it into the GCM. With this format it's completely simple. Having to edit their string in whatever way, e.g., deleting x and o and whatever other faff they've put in, can be a PITA and sometimes it even dissuades me from commenting. I mean, you want to make it as easy as possible for people to help you, right?

So i finally made progress and got a DONE4 itinerary rated and ready to purchase with AA RTW desk.

It originates in OSL. Looking at the chart from Dec 2024 posted in this thread, the base fare for that should be $5095. But i was quoted a Base Fare of $5,469.00. Is there a way to check this information for accuracy ?

Also getting almost 1900 plus dollars is taxes and carrier imposed fees. I also see Other taxes and carrier imposed fees as $1,310.10 USD. Is there a way to get a breakdown on these ?

The online tool should give a full breakdown on each tax and fee. If it doesn't for some reason, then ask AA for a breakdown.

IATA seasons are Start Of Season. 30-Mar-25. 26-Oct-25. 29-Mar-26. etc. May have been a price change.
Edit
What is your route?

I did ask them. The taxes and fees are $1,525 dollars and carrier-imposed fees is $397.00 in the Cost Summary.

According to the CSR, the $397 carrier imposed fee is from LHR. Not sure if this is the dreaded APD, the CSR could not tell, but would be surprised if its still the APD as i have less than 24 hour stop in LHR.

Now in in the breakdown of taxes and fees, at the very end, the last entry is for OTHER TAXES & CARRIER-IMPOSED FEES that comes to $1,310.10 USD. No breakdown for than. I am sure we can subtract $397 from it. But still leaves about a $1000 dollar Other taxes that are not explained. I was told they cannot break it down.

That could be it. I was told this prices was set in Sept 24. And the entry in this thread is from Dec 24. That is why i am curious what was going on. Is there a way to look that up ?

What is your route?
$397 for carrier imposed fees is low. UK APD would be in taxes.(is not a carrier imposed fee)

This is the routing in both notations:

OSL-xDOH-xLHR-HND-DEL-KUL-xNRT-HKG-xJFK-LAX-xDFW-EZE-GIG-JFK-xLHR-xDOH-OSL.

OSL-doh-lhr-HND-DEL-KUL-nrt-HKG-jfk-LAX-dfw-EZE-GIG-JFK-lhr-doh-OSL.

The JFK-LHR marquee flight was something i wanted to always do on AA (av geek thing), so that is why i am not going straight to DOH.