Please let me know if this is not the right place to post this.

Looking to travel from LAS to BKK on 2/11/26 with wife + 18 months old (economy)
- if booked via AC, which airline's baggage policy do I follow?
- on UA flight, there is a stop over of 2 hrs at HKG, am I allowed to deplane and board?
- are there any major differences between the two flights UA+SQ vs UA? (AC 50k (due to UR promo) + $93 vs UA 55k + $16.10)

AC
LAS-(UA)-LAX-(SQ)-SIN-(SQ)-BKK : 60k + $93
UA
LAS-(UA)-LAX-(UA)-HKG-(UA)-BKK : 55k + $16.10

From BKK to ICN (2/23/26)
- at what point do you pay cash vs use points? (22.5k pts vs ~$340)

Finally, 2/27/26, ICN to LAS
- unfortunately, AC seems to be the only airline that charges for checked baggage, is this correct?
- besides VS being the cheapest, are there any major differences amongst the 3?

AC
ICN-(AC)-YVR-(AC)-LAS : 51k + $81
UA
ICN-(UA)-SFO-(UA)-LAS : 55k + $41.21
VS
ICN-(DL)-SLC-(DL)-LAS : 57k + $42