A sixth-generation fighter is a conceptualized class of jet fighter aircraft design more advanced than the fifth-generation jet fighters that are currently in service and development. Several countries have announced the development of a sixth-generation aircraft program, including the United States, China, United Kingdom, India, Russia, Italy, Sweden, Japan, Germany, Spain, Taiwan and France.  The Air Force revealed last year that they had already flown a full-scale NGAD demonstrator model, but did not divulge any additional information on either the fighter or its research, development, and production timeline. USAF’s FY 2021 budget calls for roughly $1 billion in NGAD funding, and will reportedly cost an additional $6.5 billion through 2025. Meanwhile, the Navy’s next-generation F/A-XX fighter remains almost completely shrouded in mystery. It was reported in 2020 that work is underway to field a Super Hornet replacement by 2030, but the Navy’s current procurement progress remains unclear.