When I booked JFK-FRA-RZE, the JFK-FRA leg was with SQ for about 57,000 miles but when I wanted to add FRA-RZE it jumped up to 80,000 miles + 100 YQ, so I had a Nesoyen to just book JFK-RZE with SQ for 57,000 miles and make a separate booking with UA for 15,000 miles FRA-RZE and save miles and money, and I'll ask the checkin agent to set the bags to go all the way through, but then when I read people running into problems I just booked everything with SQ for 80,000 miles
Just saying...