Is there no longer first class available from HKG to the US?

Only to LAX for all of TPAC flights right now

Not going to happen until CX starts sending 77Ws to the East Coast again. It's certainly feasible operation-wise considering how more than 90% of the 777 frames are back from Alice Springs and CX is also exempted from the Russian Airspace sanction. Wonder if the move to only send A350s to JFK/BOS/YYZ/ORD is rather a commercial decision.

The only 777s with F are 777-300ER (77A). There are some 777-300ER without F (77K) and regional 777-300 (77P).
The number of 77A returned to service is far from 90%, and 6 frames have been transferred to QR .

Since 2019 Cathay has disposed of 12 B777-300ER's and added 11 A350s with another to come before the year end, all while not reinstating service to second tier European cities (Dublin, Gatwick, Brussels, Barcelona and Rome) which were served by A350s so it is not surprising that the A350s are taking over flights previously served by B777-300ERs. A little more surprising is the number of Aussie flights using B777-300s in place of A350s but I suppose this is due to a combination of cargo demand/capacity and the demand on limited numbers of qualified flight deck crew.

I should clarify I was referring to 77Ws only when projecting that 90% are back in service, and this is not counting the six frames that were returned to lessor which are now flying to QR.

Of the 39 77Ws still in fleet today, only four are still at ASP (B-KPD, KPF, KQO, KQZ), two more are already brought back and being prepared to return to service (KQM and KQY). Looks like 77W will continue to play a significant role in CX's long-haul network assuming no more frames get returned back to lessor. I don't know if anyone outside of CX is really sure they will get sent to the East Coast again however which will play a significant role on pricing due to the greater capacity than A350 (especially the 35G variant). Premium flyers must also be peeved at the loss of F class on ports (namely JFK/ORD/BOS) where they used to be readily available before the pandemic.

Only 4 leased 300's remain with the total 777 fleet. Six frames are still parked at ASP.
Currently there are 7 possibly 8 frames 'undergoing maintenance at XMN

From speaking to people in the know at CX, we haven't seen any 777 service to the east coast because the CX 777 fleet didn't have a certain approval. Which only became an issue with the Russian situation, the Cx 350 fleet had the approval. This approval has now been received and 77W operations to the east coast can resume, once they have enough 777 qualified pilots to operate the additional services. Maybe in the summer schedule we will see an F class resumption?

I certainly hope so - historically, this was one of the most valuable and available BU options. With the huge backlog of BUs sitting on DM accounts, now extended to end-2024, it will require some very careful advance planning to get them if F ever gets reinstated on the EC routes!

The ONLY reason that CX is not running First to New York is because the only equipment that they have that will do the distance non stop since the Ukraine war is the A350 which does not have 1st.
To suggest any other reason is missing the mark.

Man, I'm not sure if you've heard but CX is one of the few airlines with exemption to fly over Russian airspace which allows them to resume with the Polar route just like the old days. Polar route flights were restarted around a year ago if I remember correctly. They could certainly send the 77Ws to JFK if they wanted to; hence the suspicion by me and several others that the reluctance by CX to do so is in fact a commercial decision. One poster above has also mentioned the 777 has been lacking a specific permit to operate over the Russian airspace since the pandemic until recently as another reason.

Kind of correct in a way, the A350 fleet had a higher ETOPs rating approval which the 777 fleet did not, the 777 fleet recently received approval to operate to the same standard as the A350. However Cathay simply do not have the required number of 777 qualified pilots at this moment to operate 777 service to New York in addition to the current fleet task. This will change as more crew are recruited/promoted. This wasn't an issue prior to the Russia situation.They can overfly Russia on the way to the east coast however they must be able to plan diversions to a point outside of Russian territory, without this higher ETOPs approval this wasn't possible. The range of the 77W was never an issue for a stage length such as that of JFK from HKG given the present situation, it can in fact carry a greater payload over the distance than the Airbus equivalent, but other factors are at play.

Taking the now necessary routing the 777 cannot make NY nonstop hence the A350.

There is no shortage of B777 aircraft that would prevent the airline soon using them again to NY as is pointed out above however only 17 of the 24 are currently in service with at least 5 (perhaps 6) presently at Cathays Ximen base undergoing 'renovations'. I suspect they they among other things may be having the new business class cabins fitted and if so possibly we will see them on the NY rout early next year - This is just my conjecture of course.

I have a wild guess that the current F on 77W may also undergo some refurbishment now.