In current transoceanic operational environment, a significant share of the air traffic does not fly in the most fuel efficient route, leading to inefficient fuel usage. The flight planning process, which is planned some time ahead of flight departure in order to allow for sufficient coordination between airlines, airports and ANSPs and uses the information available at that time, may be enhanced by an in-flight re-planning, namely during the cruise phase considering some flight operational conditions updates (take-off weight, new meteorological forecasts). Then a more fuel efficient air-distance route may be found which does not coincide with the initial plan. The AIRE DORIS (Dynamic optimization of the Route In flight) project lead by NAV Portugal, with Air Europa, Iberia, Ineco, AESA and SENASA, has implemented a real time flight monitoring procedure allowing airlines that do re-dispatch, to submit new flight plans with optimized flight routes in the transatlantic environment considering weather conditions forecasts changes. To understand the flight monitoring procedures, and how to benefit of them, the project has prepared a training package.