SANTA ANA, Calif. – For nearly half a century, John Wayne Airport (JWA) has operated two runways, a commercial runway – one left and one nine right (1L-19R) — and a general aviation runway – one right and one nine left (1R-19L). Runways can be used in both directions, and therefore have opposite 180° headings at each end (e.g. 1L-19R, 1R-19L). The two numbers always differ by 18 (= 180º).
Effective July 24, 2014, due to a gradual shift of the Earth’s magnetic poles, JWA’s runways will get new number designations. JWA’s commercial runway will become two left and two zero right (2L-20R), and the general aviation runway will become two right and two zero left (2R-20L).