http://general-terms.thesaurus.ekt.gr/vocabhttp://general-terms.thesaurus.ekt.gr/vocab?tema=10236aeronautics http://general-terms.thesaurus.ekt.gr/vocab?tema=10236 engineering BT http://general-terms.thesaurus.ekt.gr/vocab?tema=10236 flight RT http://general-terms.thesaurus.ekt.gr/vocab?tema=10236 aircraft RT