The NAA allocates a unique alphanumeric string to identify the aircraft , which also indicates the nationality ( i.e. , country of registration ) of the aircraft , and provides a legal document called a Certificate of Registration , one of the documents which must be carried when the aircraft is in operation .
DET PROPN VERB DET ADJ ADJ NOUN PART VERB DET NOUN , DET ADV VERB DET NOUN ( X , NOUN ADP NOUN ) ADP DET NOUN , CCONJ VERB DET ADJ NOUN VERB DET PROPN ADP PROPN , NUM ADP DET NOUN DET AUX AUX VERB ADV DET NOUN VERB ADP NOUN .