The length and other dimensions of runway depend on the most demanding aircraft that will operate on the runway. Additionally, the weight of aircraft on takeoff or on landing, the length to be flown, weather conditions, wind condition, airport location, and physical obstacles near the runway, runway slope are all the factors determining runways length. Parallel runways are most beneficial to airside operations; it allows simultaneous approaches and maximizes the capacity from a pair of runways under weather conditions. However, the two runways separation must in accordance with Instrument Rules-IFR (when poor visibility ATC has to notified of flight details in advance, and the rules of vertical separation of flight level) specified by ICAO (Ashford et al., 2013). It must be approved for independent operations between the centerline of each runway considering with airport instrumentation and the in defined availability of diverging aircraft flight paths after takeoff The least separation is 3000 feet (around 915 m). Nevertheless, many countries require runway separation 5000 feet or more (Odoni, 2010)