"...Modern warplanes typically have been built in small quantities over the course of many years. The Navy’s F/A-18, which has been in production for more than 20 years, is being built at a rate of 42 aircraft per year. But the F-35 Lightning II is expected to be built at an unprecedented rate — as many as 230 fighters per year.
F-4 History
............In the 1960s, most of the thousands of McDonnell employees were involved in delivering the Phantom. Between 1966-67, production averaged 63 F-4 aircraft each month. Production peaked at 72 Phantom aircraft a month in 1967........