Proper closure of thread
jiejie,
Thanks for the heads-up re cheapOair. Turns out my itinerary could not be booked by them either. For whatever reason, a local TA couldn't do it even though they thought they could. Long story short. I broke up my original itin into 3 tickets and finally booked them all on expedia. Airlines used are MU & CZ. Slightly higher total fares than what was first shown on ita. To my surprise, I found that YQ and taxes on MU & CZ are almost 50% of total fares!
This properly close this thread. Thank you to all for the help offered.