which subsidiary of grand china air serves both beijing capital international airport and dalian zhoushuizi international airport ?
select distinct var_uri where brack_open dbr_Grand_China_Air dbo_subsidiary var_uri sep_dot var_uri dbo_targetAirport dbr_Beijing_Capital_International_Airport sep_dot var_uri dbo_targetAirport dbr_Dalian_Zhoushuizi_International_Airport sep_dot brack_close