I've never heard of any laws pertaining to resale of redemption tickets, but most airline loyalty programs prohibit the practice. I'm surprised ctrip did/does that because they are a pretty big company now.

Three comments:
1. Many airlines do not credit credit miles on their own FFP for the cheapest fares of partners.
CX P fares have been around for a few years and BAEC is, of course, well aware of it and decided not to credit any avios rather than the 125% for a bit more expensive biz fares. SAme for O, zero avios rather than 25% for slightly more expensive fares.

2. T&Cs of all airlines prohibit dales a miles/redemption tickets. Trip.com is a major OTA, it will never risk a retaliation from a major airlines by selling redemption tickets from someone else. Maybe that happened decades ago.

3. Using a major OTA (like trip.com) can work fine as long as you don't need to change the ticket/flight. But in case of flight cancellation or voluntary flight change, it can be a major hassle.

I can speak from experience and agree.

I'm not redeeming points or paying cash for J on TYO-HKG. It's too short. Having said that, it would be nice not to get either P or O-fares going forward. I like to get something rather than nothing.

Does Trip.com have a free 24-hour cancelation policy? This could be an easy way to figure out the fare code before committing.

For the most part, they adhere to the airline's policies and are rather transparent about this. Priceline is the only OTA I know of that offers its own guarantee (there might be others).

I had tried to book with Trip.com last 2years and 99% has been failed with the booking when you come to the payment. I only manage to book 1 ticket for my partner travelling from Vietnam to Thailand.

Once I change to Go To Gate, Expedia or Vayama any of those sited then the booking confirmed and issue ticket with no problem, of course the fare was 10 to 20 euro higher on those site.

Trip.com just lure you to their page and waste a lot of your time. Even the amount that Trip.com wanted was on hold in my Revolute account and after 30min the amount was returned, so I find it strange they said the payment didnt went through.

As far I know is only Expedia show booking class in their system.

Expedia does make it very easy. That is true!

What you said is incorrect. This is only the case with crediting CX flights to AA. This is not the case with BA (O class being the only exception within Y cabin, but until recently CX members don't earn anything on O class, either), and certainly not AS (all classes can be credited).
Are you sure this is intentional? P class is above I class (the sequence is JCDPI), but I class still earns the normal rate with BAEC. I would say this is an oversight, or else I class should also earn nothing.

No redemption on 825 and 829 until next year at least.

​​​​​They are selling out ticket in Y north of $3500 as AC will not run 015/016 due to Canadian airline not able to fly over Russia
​​​​

Does anyone know how to book the O fare class that I see on expertflyer?

J9 C9 D7 P0 I0 W9 R5 E0 Y9 B9 H9 K0 M0 L0 V0 S0 N0 Q0 O2

If there is no O fare for your itinerary, you cannot get an O ticket even if you have O availability

I looked up the Avios earning on both BA and Qatar, LHR-HKG on CX as example
Qatar earns 125% on C,D,I,J,P fare while BA excludes P.
Also, Qatar is more generous for mid-economy tiers but earns nothing for the lowest tier.

Y B QR 100% BA 100%
H QR 50% BA 100%
KLMV QR 50% BA 25%
SNQ QR 0% BA 25%
O QR 0% BA 0%

Interestingly inconsistent, but at least for KLMV tiers it isn't too bad.

Calling CX Customer Service Number to Book Specific Fare Code
 

I have a good experience of recently using the CX customer service number (at the bottom of the website) for the United States. For Japan Airlines FFP, I would only be able to earn mileage / qualifying points for booking class L and above.

I called the number around 6 PM EST yesterday and the automated number originally advised me that I would have a 10 minute waiting period, but I was speaking to an agent within 2 minute's time. After specifying the date, route numbers, and specifying that I want to have the fare class L, the agent confirmed my name, date of birth, flight details, and also sent an email to confirm the informations.

Once I confirmed the information was correct, I then got a link via email again to purchase my fare. Sure enough, the fare class L was there on the e-ticket PDF. I would recommend their customer service if needed and the phone call was no more than 15 minutes.

Altlough, I wish CX would still peg their fares to specific fare class and associated benefits. On Japan Airlines website, you have the choice of the cheapest (of what's available) fare classes, upgradable, and then fully flexible options, all which have different accumulation points based on fare class for your oneworld programs.

QR and BA have the nice feature that you can transfer avios from one program to the other at will. No hassle.

If avios is what you care about, it is easy to have both QR and BA accounts and choose where to credit a CX flight. But that only applies to avios, not to BA TP.

Trip.com, Skyscanner, Ctrip, Wing On Travel (based in HK) are in the same group of companies. I once booked a ticket with them and later on realized the ticket was issued in Sweden and the cost of it was HKD14k while I was paying HKD15k to them. The airline official website was selling at HKD16k if issuing in HK. However, there had been hiccups before departure and it was nightmare to contact them to solve the issue. Luckily nothing happened at the end and the so-called 'risk of boarding denial with my ticket' was due to the incompetent CX customer service.

I had no idea they were all part of the same company. What's the advantage of one over another?