I am not keen to own Singapore Airlines or Cathay Pacific Airways because they have a lot of competition from budget airlines.
But I like some airline-servicing companies based in Singapore, including SATS, in the catering business, and SIA Engineering, which overhauls aircraft. They have subsidiaries in many Asian countries. The stocks yield around 4%. They aren't supercheap, and the Asian markets generally aren't cheap enough for me. But longer term, if you want to park money in Asia, both companies will do well.