You've seen this link ? Scroll down to the "For Pilots" section for a name and email address to ask questions/apply:
Get Involved - Air Serv International, Inc.
My son flew for them years ago and lived in Afghanistan so I don't have any current info. The pay was not very good but they treated him OK. He met some really nice folks, a couple of whom are apparently still with the company. Sorry I can't be of more help.