1.Subject to paragraphs 2 and 3 of this Article, aircraft operators that hold an air operator certificate issued by a Member State or are registered in a Member State, including in the outermost regions, dependencies and territories of that Member State, shall be able to use the following units to comply with their obligations to cancel units in respect of the quantity notified pursuant to Article 12(6) as laid down in Article 12(9):
(a) credits authorised by parties participating in the mechanism established under Article 6(4) of the Paris Agreement;
(b) credits authorised by the parties participating in crediting programmes which have been considered eligible by the ICAO Council as identified in the implementing act adopted pursuant to paragraph 8;
(c) credits authorised by parties to agreements pursuant to paragraph 5;
(d) credits issued in respect of Union level projects pursuant to Article 24a.
2.Units referred to in paragraph 1, points (a) and (b), may be used if the following co
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