Hompy,
I cant speak for all NGO's but the UN Agencies (such as UNICEF) use a centralised system for air assets.
The UNWFP (Rome based) are the agency with the experience and expertise here, under their wing the UNJLC (UN Joint Logistics Center) has a branch called UNHAS (UN Humanitarian Air Service) these guys usually run airops on behalf of all UN Agencies on a shared cost basis.
If a UN Agency wishes to contract its own air assets it must get the approval of the UNASU (UN Air safety Unit) also part of UNWFP, this is the ultimate authority in terms of UN civvy air ops, they check AOC's, crew qualifications etc.
Most large air ops are contracted out to pre-qualified suppliers, local ad-hoc time/trip charters must be approved by the ASU.
It would be highly unlikely that such contracts would not include crew.
If you would like to get involved, you could register an interest at
[email protected] If you're interested, your skills could be useful in a ground based role.
Cheers