I have some business travel coming up and I am trying to figure out the fare difference: If I fly on UA as follows it cost $6300: 2/18 EWR - NRT UA79 Z-Class 2/22 NRT - SIN UA9675 (operated by ANA) Y-Class 2/27 SIN - EWR UA 896 & UA 116 Z-Class If I keep NRT to SIN on UA then it jump to $11500 for Z-Class all the way. It does not give me options for business on ANA. I though I could get a different carrier on NRT to SIN but my EWR-NRT and SIN-EWR jumps to $7900. I understand that this makes 2 one ways, but even with a flight on ANA it is cheaper. Is there a way to get business via multiple airlines without paying $11500? I would get flagged for such a high fare.