The FACA programme (Future Fighter and Attack Aircraft) was once the largest investment in armaments made in Spain.When choosing the F-18 of McDonnell Douglas (today Boeing), the Air Force has had since 1986 - for the first time in its history - one of the most advanced fighter planes ever designed, with very wide possibilities for adapting new systems throughout its operational life, as evidenced by the Retrofit made in the early 1990s and the current MLU. The FACA program (which ultimately remained in 72 aircraft), followed by the CX programme (for 24 aircraft), was the most important challenge faced by the Spanish Air Force since its creation.The professionalism demonstrated by the commission in charge of flight and technical evaluations won the admiration of the countries involved in the programme. The F-18 Hornet has proven to be the ideal aircraft for air forces in countries with large territorial areas and wide coastlines, or extreme weather conditions.