The United States and China may be the only countries that can reasonably be expected to produce a full-fledged 6th-generation fighter jet alone. This is not to say that other countries can’t produce 6th-generation fighters if they are willing to commit, but that it is at least somewhat unrealistic or infeasible in the real world. However, much depends on definitions, including what counts as a 6th-generation fighter. When assessing a country’s ability to produce a fully fledged 6th-generation fighter, a number of fundamentals are important.