It is very often mentioned to as Lisbon Airport’s +1, Montijo airport will be used to devour overflow traffic from Lisbon airport. The signing of the memo is to be important to Montijo airport’s construction as it will plan the construction of Montijo airport as a complementary airport to Lisbon’s international airport called Humberto Delgado. This nice combination will let Lisbon’s main airport capacity to rise to fifty million passengers per year and seventy two aircraft movements per hour. According to our sources , the works will cost around 1 billion euros, which will be paid in full by ANA - Aeroportos de Portugal. The accord also foresees the expansion of Lisbon’s main Humberto Delgado airport. Despite there still being a lack data on the environmental impact of the conversion of the military air base to a civilian airport, it is expected to be operational by year 2022. An environmental impact declaration is expected to be signed during the start of the 2019.