Help me get to Chennai (MAA) and HKG
Y+ is at OLCI but you can pay for confirmed Y+ in advance. Look if they offer an annual Y+ option.
As to LCC from HKG-MAA go to Tiger Airways or Air Asia website.
But if I were you I would stick to SQ or Cathay.
By the way, Biz in a UA 747 rocks. Especially upstairs. Coach is very spartan.