Be sure to allow plenty of time; don't rush at last minute. Although you can print boarding pass at home, it's not like other countries where you go right to the gate. At entrance to immigration, Air Asia may ask you to go back to a document verification counter (no charge).

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What is the minimum total that worth asking for a refund on tax?

AA charges something for servicing the claim. I have got back some cash from a long flight, and one from a Singapore flight but another recent Singapore one rejected. They have not replied to email or chat inquiries.

Truly Malaysian! I was the first to use the toilet on the plane...phew, reeked of stale urine and had a hair stuck on the edge.