It has been a while since the maximal speed of jet fighters stay the same. Ever since 1970s, the top speed of fighter jets are always around mark 2. It is already 2016, it hasn't changed for the jets. While there are already some hyper sonic vehicles, missiles, etc. being developed which can go beyond the speed of mark 5~10, there is no word of any new fighter jets will get such feat.
Imagine if a fighter jet will go at the speed of mark 5+, no current anti-aircraft missiles will be able to catch it unless it's "off-guard". In a hyper sonic fighter jets, you can easily outrun all air defense missiles. Correct me if I am wrong, most air defense missiles have a maximal speed of mark 2.5~3.5.
So why nobody has even tried to increase the speed of jets to out run the missiles?
Imagine if a fighter jet will go at the speed of mark 5+, no current anti-aircraft missiles will be able to catch it unless it's "off-guard". In a hyper sonic fighter jets, you can easily outrun all air defense missiles. Correct me if I am wrong, most air defense missiles have a maximal speed of mark 2.5~3.5.
So why nobody has even tried to increase the speed of jets to out run the missiles?