1. Each aircraft operator shall monitor the non-CO₂ aviation effects from its activities performed by aeroplanes equipped with jet engines in CO₂ equivalent (CO₂(e)) per flight.

2. The aircraft operator shall calculate the CO₂(e) per flight using the GWP metric, in particular GWP₂₀, GWP₅₀ and GWP₁₀₀, resulting in CO₂(e) values for three-time horizons (20, 50, and 100 years) for each of the monitored flights.

3. The aircraft operator shall use efficacy as defined in this Regulation and in NEATS, to refine the GWP as referred to in paragraph 2 for calculating the CO₂(e) per flight unless the aircraft operator provides evidence to the competent authority that it is not possible to use efficacy.

4. To calculate CO₂(e) per flight each aircraft operator shall apply a CO₂(e) calculation approach covering the following elements:

(a) the fuel-burn module and emissions-estimation module, as described in Annex IIIa, Section 3;