which subsidiary of aeroflot serves both vnukovo international airport and vnukovo international airport ?
select distinct var_uri where brack_open dbr_Aeroflot dbo_subsidiary var_uri sep_dot var_uri dbo_targetAirport dbr_Vnukovo_International_Airport sep_dot var_uri dbo_targetAirport dbr_Vnukovo_International_Airport sep_dot brack_close