Technological change is at the root of the economic and social progress that has been experienced since the first industrial revolution. In this manner, technology is increasingly present in our society because it improves people's quality of life. As a consequence, over the last few years, new kinds of technology have also been introduced in airports allowing digital transformation in them. The implementation of technologies in airports continues to be an aspect in development today. Despite great technological advances, many airports still do not enjoy fully digital operation of their landside and airside processes. This produces a difference in the level of digitization between airports that is often justified by the different necessities of capacity, economic resources or sustainability awareness. However, the vast majority of airports consider a digitization plan to be carried out in the coming years. Artificial intelligence in all its variants, electrically powered autonomous vehicles, drones and biometric systems are some of the technological trends that airports incorporate as part of their new infrastructure. These trends aim to change the way of operating and managing airport activities. This project allows the reader to understand the usefulness and performance of the technologies that guide airports to become smart airports or airports 4.0. In this way, the digitization of the most developed smart airports is evaluated and compared with proximity airports. Likewise, possible changes are exposed as recommendations that would benefit the different tasks on the airside and the passengers flow management in the terminal building.