One thing I've noted recently is that the chances of getting different answers to the same question from the AA RTW desk have increased significantly.

I asked yesterday about how additional N. America segments were priced for a passenger traveling on a DONEx, specifically if an additional segment bought for a 2-class flight needed to be purchased in A or L, or could one specify an additional segment be sold in D (for $150 less than in A) and then be flown in FC because of the rule regarding D booking to A on two-class flights in the USA.

The answer I got, after a conference between the rep and a supervisor, was yes, it could be bought in D and used for A space if available.

Today I called back to do the deed, and guess what - only A or L, no D additional tickets allowed (unless it's a 3-class flight, which this isn't.)

A minor irritant to be sure, but one I could have done without. I decided to buy the seat in L and saved $400 instead of paying an extra $150. Upgrades happen, so no big deal. But bait and switch is a pain.

On a somewhat related point, I'll just note that I've gotten a bit tired of the situation where I get into a rules dispute with someone from the desk, and then eventually prevail, and then there's little acknowledgment that moments before the agent was telling me I couldn't do what I was eventually told was permissible (this came up quite a bit in terms of getting the Canadian discount, whether I needed a Canadian credit card if I was actually in Canada when I made the purchase, whether I had to live in Canada, etc.). There were also a couple of times where I believe my PNR was noted to indicate that I couldn't do something, apparently to avoid my trying to convince a different AA agent that my interpretation was correct.

Going back to Gardyloo's original posting, during my brief experience with booking a RTW ticket, it seemed that whenever I was told I COULDN'T do something, some remark would immediately be added to my PNR to that effect. Not sure if I was just being paranoid though...

What the second agent told you can't be correct. The rules say:

In other words, if you are on a DONEx you can not buy an A class segment as this would allow someone on an L ticket to relatively cheaply buy very expensive first class tickets (LHR-MCT for example).
The other way to do it is to buy a D class segment and than switch flights.

I pointed that out to her but she was adamant. I didn't have the patience to ask for our favorite RTW agent or make a federal case out of it. F is wide open on the segment in question, and the upgrade will clear, meaning her "interpretation" will have cost AA $400.