how many airlines have a hub at an airport run by administradora coahuilense de infraestructura y transporte aéreo ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open var_x dbo_operator dbr_Administradora_Coahuilense_de_Infraestructura_y_Transporte_Aéreo sep_dot var_uri dbo_hubAirport var_x sep_dot var_uri a dbo_Airline brack_close