Fare rule:

TRAVEL FROM LAST STOPOVER MUST COMMENCE NO LATER THAN
12 MONTHS AFTER DEPARTURE FROM FARE ORIGIN.

That said, almost all tickets are valid for one year from DATE OF ISSUE so that's independent of the fare rule. I wouldn't be expecting to use things more than 12 month past issue.

i am trying to book OW RTW. my first departure will be Dec 2024. I want my last leg around Nov 2025. It has not open yet. That makes me worried that they only allow me to change to anything before March 2025

Representative is wrong.

Almost all tickets except RTW tickets.

I've book dozens of AONEn tickets around 9-10 months prior to first departure date with dummy dates for many of the segments and then updated the dummy segments when the dates I wanted were available to be booked. I almost always commenced my trips in the late fall and end them in the fall of the following year resulting in 21 months, plus or minus, between the issue date and the date of the final flight segment for each of the AONEn tickets. On quite a few of those tickets I have routinely traveled over 330-360 day period from start of the first flight segment to the start of the last flight segment.

FWIW, I booked most of my RTW tickets with AA RTW desk, and few with BA, and one with JL many years ago. slhu82, you indicate you booked this through QF. It doesn't sound like they know the rules which could be problematic unless you get an agent that knows the rules when you go to make your changes.

I've also upgraded AA with SWU from GRU-JFK on a DONE5, but that's the only time I've been on the 77W on AA codes. Looks like now only MIA gets the 77W on GRU flights, my flight in August is 772, but I'm on a JL code again anyway, so couldn't upgrade regardless.

I'm pretty sure AA SWUs are for the entire itinerary in one direction up to 3 segments, regardless of stopovers. UA's don't work on stopovers, you do have to use a 2nd SWU in that case.

UA hasn’t had SWUs in years and years. But yes PlusPoints (PP) are good for a one way - but not a stopover. That said, I’ve made SIN-SFO-PPT work with 40 PP (same as 1 SWU) soooooo there’s value

I booked with AA. Total fare was just under $4300 USD (I posted in the pricing thread but can't quickly figure out how to link to the post).
I'm not sure about anything to do with changes.

aaupgrade,
Can you advise on how best to make the date changes?

I booked DONE3 with AA desk. Travel start is end January. Travel end is August.
Aside from the start date, all travel is after the fare calendar is open.
So, I booked 14 segments cascading down over the open calendar. Not much room so almost each day has a ticket.

When I call to change my 3rd segment when it opens up on the calendar all of the subsequent segments will have to be changed.
Same with 4th. And 5th. Etc.

I asked about it here
post192

Sounds like you might have created a bit of a problem for yourself there. If any of those flights you've put in placeholder dates for have under a 24 hour stopover then it's a connection and you'll have to pay the $125 fee to change them into a stopover. Ideall you do that only once after enough time has passed that you have more room to work with.

But as far as just the date changes go, wait a while until more of the calendar has opened up and change all of your later segments to the end of the calendar until you're more clear on when you want to fly, then move them forward to the actual dates you want to fly. Date changes alone are free, so you can do that as needed, just so you don't have to change a connection to a stopover. Since you're finishing your trip in August, that's when I'd look to make the initial date changes, so then you can move all of the flights after segment 2 or 3 to August in one batch. Unless you have your dates planned already of course.

If the base fare changes in the meantime you'll need to fly the first segment before doing much of anything to the ticket. I believe you can still do date changes without refaring, but any changes to ticketed points (including connection to stopover) will trigger a reprice to the new (very likely increased) fare.

Another thing to keep in mind is married segment availability. Any connections you have are likely married segments, meaning D availability is different on the pair than the individual flights. QR and QF are notorious for limiting married segments on D fares closer to departure date, so definitely best to set dates sooner than later (but 4-6 months is plenty, I don't mean you have to rush as soon as you're at 330 days).

I concur with what dvs7310 posted. Yes, if you make changes to the 3rd segment then all other affected segments will also need to be changed.

To the best of my knowledge and experience, if you are only changing date and times AND NOT changing stopovers to <24 connections or vice versus, then there will be no repricing prior to trip departure. Ticket repricing to new fare will occur if you are making changes to your first flight coupon OR are changing your ticketed points. When I made my reservations I always made sure that any placeholders were done with the stopovers and connections I wanted for my future dates. In a few cases I made a couple changes prior to departure on my first segment, especially for routes where A class (in the case of AA domestic now D class) were few and far between (DFW-EGE flights in particular and also ORD-ANC) and A class on QF SYD/MEL-LAX, CX on HKG-JFK, etc.

So, if I booked like you starting in January with end date in August, with (for example with travel grouped in spring and late summer) then I would make a batch of changes in July and another batch of changes in October. Now if you are flexible it may be easier to do changes after you fly your first flight segment as most of your journey's segments should have plenty of D availability; the only exception might be your two ANC related flights depending on the time of year your flying those which I would guess may be somewhere between April and June. I checked D availability on HNL-ANC and ANC-LAX flights and there was plenty of availability throughout May with the exception of about 1, and in some case 2 days a week. If you could easily change your travel plans by one day, then waiting should not be an issue as long as your not flying during a special event/high demand period (think CDG during the Olympics). With most HNL-ANC flights having D2-D4 and most most ANC-LAX flights having D7 availability. I would suggest getting a EF subscription if you don't already have one and do research for this year's dates corresponding to the same period and day of the week for your actual planned dates for next year. That way you have an idea of what availability will be probable for next year's dates.

Enjoy your trip.

All airlines have to give 12 months from the first coupon flown, its IATA rule. They can restrict this by a fare max stay but not by limiting ticket validity itself. For any international travel at least.
I have seen that airlines do not follow this rule for award tickets (many give 12 months from the issue date only) but I guess this has to do with the nature such tickets.

I've definitely had AA hold me to 12 months from date of issue before, and that was for international, but was not a DONEx ticket. I don't know if that's different or not, but if it were 1 year from date of first flight I'd have had another 3 or 4 months on it.

Is it IATA resolution 735?

Page nine of this document from Australia's consumer regulatory body says IATA resolution 735 "sets the period of validity for a normal fare interline ticket at one year from the date of commencement of the flight".

However, I found this for Qantas, stating the ticket "expires ... 12 months from the date of issue".

Thanks dvs7310 and aaupgrade

Doh!

I specifically asked three different AA RTW desk agents about the less than 24 hour connection on some of the placeholder flights in my itinerary. I was concerned that they were connections. And each said that 'no, it's not a connection. It's a separate flight. No problem to stay longer. No problem to change the dates'. paraphrasing
Right before I paid I asked just to be sure.
Argh! I did not ask specifically if the change would incur the fee. I knew (my understanding) of the date/time change rules at the time of those phone calls but figured they must know what my concern was.
Well, we'lll see.
I'll keep you posted.

I was not aware of that at the time. I thought I was just lucky.

If they do try to charge you, just tell them what you were told and see where it goes. In the grand scheme of things $125 isn't a huge amount, BUT if the fare increases then you need to do it after the first segment is flown. So basically if they are connections currently, just leave them as connections during reschedules between now and your first segment, then separate them after.

I know I keep saying "if" the fare increases, but I fully expect it to sometime soon. *A pulled their fares a while ago and repriced them to a more normal price. I'm not sure how much longer the OW fares will last either, so just be aware of that and don't do any changes that need to be repriced until you fly your first segment.