Yeah this looks like I'll be on a 737. Luckily I'm on this CX codeshare so I can fly the whole trip on one ticket if there are IRROPS.
http://www.miat.com/news.php?newsid=155&lang=chn
I'm AA EXP/OneWorld Emerald but don't expect anything extra or lounge access in ULN
since MIAT isn't part of OneWorld. Since I am on a CX flight number, arriving from a CX flight, I hope I will be able to use The Pier in HKG to freshen up after my arrival.
I have a co-worker flying with me but on a separate ticket so its not codeshare, we shall see if they let him in as my guest in the CX HKG lounge, if not he has priority pass access.
I'll report back in August how it all goes.