Airserv Limited, based in Entebbe, is a wholly-owned subisidiary of Airserv International, based in Warrenton, Va, USA. ASL is a commercial ("for profit") operation, as opposed to ASI being a charitable ("not for profit") organisation (under US rules).
If your question relates to the incident in South Sudan last week involving an ASL Caravan, here is a link to info on that occurrence.
Air Serv international
Grizz