If there are award seats, you should be able to change it by paying 50USD or 7500AM. CX will not make the change for you for free just because it is on the same day. I don't think it would be a good idea for you to just show up later that day and expect to be able to take a later flight.

My guess would be no, but there's no harm asking on arrival in HKG. I highly doubt SGN will do anything about your onward flight.

Not sure that was what db07mufan meant, but it should go without saying that intentionally no-showing isn't best way to approach this.

Possibly the American concept of same-day changes including, later in the day flights for some..

So I just called CX to stress test this feature since I have an upcoming CX2690 and was intending to change it to CX658 this coming Saturday.

The same day free change according to the agent, was that change fees are waived. You still have to top up any fare difference if your fare subclass is sold out.

This however was posted on their FAQ

For early standby, can I take a flight a day earlier than planned?No, early standby can only be used on the date of travel. It must be an earlier flight departing on the same day from the origin airport.

i will test and let all know this Sat at the airport

Did you buy flex fare?

yes

I think AA is changing to dynamic pricing; but when this ticket was purchased, it was fixed.

Do you have an update?

no fees but you will need to top up fare difference

what about asiamiles issued redemption ticket? from fare rules prospective it is a fully flexible fare, but once its airport control it can be used for any available seat?

reporting back

NRT changed from 501 (1030am) to 509 (9am depart) for economy on redemption ticket no issues. flight was showing mostly empty on expertflyer (Y9B9 etc) and i was able to redeem award economy the day before it goes to airport control. OWE but doubt it mattered. i dont know what happens if it was restricted revenue ticket

took the risk arrived airport early at 720 and in a desertee Jal F lounge

Any recent experience with same-day flight change when transiting through HKG on Asia Miles J redemption (say xxx-HKG-SIN and want to change to earlier HKG-SIN)? Does having check-in luggage matter? Pre-Covid I could do this with no issue for both revenue and redemption ticket at the lounge.

these days they are less likely to do it, and if you have checked bags, don’t even count on it.

From a business point of view: if your flight to SIN is already overbooked and the flight before has space (which could well be the case depending on when you travel) then I'm sure it would be approved. There are definitely other things to consider though.

issue is if yoi have checked luggage, they would be very hesitant and give you all sorts of disclaimer that bags may not be loaded. and if the bag misses the plane you would spend ur first day macking about chasIng bags and organize delivery to your hotel. if the origin airport can book you on earlier flight and luggage tagged accordIngly its a different matter. but counting on CX to. find your bag and retag and make it, doubt it