Hi, I need to fly from PIT to SIN on or around 10/5. Looking at google flights, it seems I can connect through DFW or ORD, then HKG or NRT. I would like to upgrade to business using miles+copay and I am currently Gold status with $3.5-$4k 12 month EQD. Does anyone have suggestions on which route will be the most likely to clear an upgrade on the trans pacific leg?