Himalaya check out:
http://www.jobsataramco.com
This site has all the info you're looking for in regard to ARAMCO. For DHC-6 you could try getting in touch with Kenn Borek in Calgary, Ab. Canada Their website is at:
http://www.borekair.com/
They operate in the Maldives, (and World-wide) and have a very large fleet of twin otters.
Cheers
Randy_G
If you can't stand the heat...
then turn up the air conditioner !! 