Winkdaddy

I need some advice. I am flying with a colleage SFO-SIN on United in August. We land at 6:15AM. We want to catch the 9:30AM SQ flight to BKK. We will both have checked bags. I bought the UA tickets, then I am purchasing the one-way SQ ticket separate.

1K help desk seemed to think we can check bags somehow all the way to BKK if I let the US SFO agent know. Is that correct? They will coordinate the bags with SQ since they are same Alliance even though completely seperate bookings?


Thanks