Article 28a 2.

By way of derogation from Article 3d(3), the quantity of allowances to be auctioned by each Member State in respect of the period from 1 January 2013 to 31 December 2026 shall be reduced to correspond to its share of attributed aviation emissions from flights which are not subject to the derogations provided for in points (a) and (b) of paragraph 1 of this Article.