Thanks all for the suggestions.
We changed to an earlier flight in order to attend a wedding in Shanghai. So it will be even less than 23 hours.
UA BOS-SFO-ICN 3 pm arrival
OZ ICN-PVG 10 am departure
We booked two rooms at the ICN Sky Hotel which is very close to the airport
http://eng.hotelsky.co.kr/?gclid=CJa...FYNo5QodOWCCtA
Expedia has good consumer's rating for this hotel. Anyone stayed there before?
By the way, our kid is not really small. He just graduated from high school and will attend Harvard this fall.
Since our flight BOS-SFO departs at 6 AM, we will get up at 3 am. So we will be exhausted while SFO-ICN flight arrives (24 hours already), even though we will fly UA new 747 business class.
The plan is to take hotel shuttle, check in hotel, find a place nearby to eat, and relax there.
Sounds reasonable?