I'm going to give it a definite maybe. In theory, yes, you should be able to change your frequent flyer number for each flight. Usually you can do it either at the gate or in the elite lounge (if you have status to gain admission). However, there are reports on FT of trying to do it, and the agent says that the number was changed as requested, but then getting NO credit for a flight because each program claims that the flight was already credited to another program, regardless of what the boarding pass says.

I've been able to do it - so it's definitely possible - but fully endorse that it may take several agents and confusion. I agree that I definitely wouldn't count on it being possible without a lot of hassle.

You can also just skip adding the FF#, then request credit for individual flights with each program after travel is completed.
Obviously, the downside is that if there are benefits tied to having the program on the ticket, you may not be able to use those (eg, seat assignments). YMMV

Is there a free source available which shows base fare as a function of departure point for these round the world tickets offered by One World and Star Alliance? I did a brief search, but didn't find anything recent. Obviously a person could collect the data by brute force through the online booking tools; but I'm hoping the data is already freely available.

Thanks in advance for any assistance.

Base fares are not freely available in a convenient, searchable format; that's why services like Expertflyer are in business.

American explicitly prohibits changing the FFN if you obtain any benefits (more of issue in coach bookings) and also disallows number change post flight:
(4) You cannot accrue partner airline miles with your partner frequent flyer number if you have already used your AAdvantage® number to obtain any AAdvantage® Rewards and Benefits such as First or Business Class upgrades, baggage fee waivers, priority boarding, access to Preferred seats or complimentary access to Preferred / Main Cabin Extra seats
(7) After your flight departs, you will not be able to change your selection of a frequent traveler program with respect to that flight.
In the past I used FFN status to access first class CX lounge at LHR and also BA LHR First lounge just by showing my status card when the ticket had a different FFN but not sure if that works in other lounges.

What I described is the idea of booking a ticket but not adding the frequent flyer number. You fly your segments and then submit individual flights for retroactive credit with the desired program(s). This is perfectly legal because you are not trying to double-dip in any way. My following statement, "Obviously, the downside is that if there are benefits tied to having the program on the ticket, you may not be able to use those (eg, seat assignments)." refers to the idea that if you choose to withhold your FF# before flying (in order to claim retroactive credit afterwards), there may be a trade-off in doing so. For example, booking a BA business ticket still means you have to pay a seat assignment fee if your elite FF# is not on there. Make sense?

What you are describing is the following: (4) If someone puts their AA number on a revenue ticket to benefit from elite perks, then swaps to a different acct after such perks have been realized.
(7) someone cannot choose to credit a different program after traveling on the flight

Not sure what you thought I was saying, but this is a case of apples and oranges.

Does QF75 ticketeby AA as a codeshate count as 1 of the 4 necessary QF annual flights
 

Are you asking a question about the necessary flights required for QF status? If so, you should ask your question in the QF forum:
https://www.flyertalk.com/forum/qant...ent-flyer-498/

They let you ticket this with all those DFWs and DOHs? :eek:

why not? There’s no rule on number of times you can transit a place? (within the segs per continent obv)

Nice. May have to copy some of that :idea:

If maximizing earnings is your main goal it's certainly a pretty itinerary!

DONE4 D class availability
 

I want to change my flights after the first flight but I am not sure if the flights are available. When I use ita matrix and restrict it to booking class D, I see there are tickets available in D but when I use oneworld page to book a new ticket that includes the flight segment, it doesn't show up. Does it mean that this particular segment is not bookable via DONE4? For example, I am trying to book HND-LON on JAL but on certain days the flight does not show up on oneworld page but D class is available on ita. Similar issue with CX for inter-asian flights. Oneworld shows only a limited number of flight combinations but ita shows nearly all...