This document is a preliminary version for the Deliverable 4.1 within WP4 Models for airport LAQ&N performance and operations. The main objective is to describe the work done in T4.1 Selection of airports and operations scenario. For this purpose, the following points will be explained in the document sections:1.Selection of Use Cases (airports for study)2.Baseline scenarios description including:a.Terrain and meteorological datab.Airport terminal and runway/stands configuration.c.Traffic demand and typed.Procedures (SID/STAR profiles)3.Identification of the applicable regulatory framework of the Use Cases to address emissions and noise from aircraft engines and propagation in the vicinity of the airport.4.LAQ&N key performance indicators (LAQ&N- KPI) applicable to the Use Cases.5.Critical pollutants of LAQ for each Use Case.This work intents to establish an operational environment for the following tasks within WP4 and for WP5 and WP6 in terms of optimization setup and validation.This document will be updated with new inputs from T4.2 for the D4.1 final delivery.