You can contact Air Uganda, in Rwanda : HERE
Air Uganda started flights to Rwandain February 2010. The airline signed a partnership with RwandAir, during the same year.
But in 2012, Air Uganda decided to stop the partnership with RwandAir. Code Share resumed in July 2013. Since 31 March 2014, Air Uganda suspended all flights to Kigali, more infos : HERE
Today Air Uganda serves Kigali 5 times a week, via Bujumbura depending days. The aircraft used is a CRJ-200 (50 seats).