which subsidiary of norwegian air shuttle serves both palma de mallorca airport and gran canaria airport ?
select distinct var_uri where brack_open dbr_Norwegian_Air_Shuttle dbo_subsidiary var_uri sep_dot var_uri dbo_targetAirport dbr_Palma_de_Mallorca_Airport sep_dot var_uri dbo_targetAirport dbr_Gran_Canaria_Airport sep_dot brack_close