Working on a mini-rtw. Any idea why, when flying BOM-BKK, only TG flights show available, but if flying BKK-BOM, AI flights are now available? Is it some silly game that TG requires?

Oops - Question 2: How does the zone thing work for open-jaw? I'm looking at my 3 stops as IST, BOM & HKT. I could theoretically do BOM-SIN as the 3rd stop, and then buy revenue to HKT then on to BKK, but not sure if I can do open jaw as SIN in and BKK out...