which subsidiary of comair serves both king shaka international airport and cape town international airport ?
select distinct var_uri where brack_open dbr_Comair_ attr_open South_Africa attr_close dbo_subsidiary var_uri sep_dot var_uri dbo_targetAirport dbr_King_Shaka_International_Airport sep_dot var_uri dbo_targetAirport dbr_Cape_Town_International_Airport sep_dot brack_close