sentences:  For example, an Air Coryell play such as "924 F stop swing" indicates that the primary wide receiver (X) should run a 9 pattern (a go), the tight end (Y) should run a 2 pattern (a slant), the secondary wide receiver (Z) should run a 4 pattern (a curl) and the F-back should go out for a swing pass (see Offensive nomenclature).Timing and precision are extremely important under the Air Coryell system, as the routes are intended to run like successive clockwork in order to be successful.When Don Coryell was the head coach of the San Diego Chargers, his teams led the NFL in passing for 6 straight years from 1978–1983, and again in 1985.