Airfares booking - wiki. You can get here all information that you need. All links checked by our support team. The biggest price falling on tickets this summer. Here is the list of airfares booking wiki pages: Physical Characteristics 353 operations when the separation between their centerlines9 is as little as 3000 ft (?915 m). However, most countries still require 5000 ft (?1525 m) or more.10 At the opposite end, full coordination is required between any pair of operations on close parallel runways under IFR. For example, when a takeoff on one of the runways will follow an arrival on the other, the takeoff roll cannot begin before the landing aircraft has reached its touchdown point on the other runway. In the US, close parallel runways are pairs with centerline separations of less than 2500 ft (762 m). Medium-spaced parallel runways make possible independent departures from the two runways or independent �segregated� parallel operations, meaning that one runway can be used for arrivals and the other, independently, for departures. However, arrivals on two different medium-spaced parallel runways are not independent. It is important to realize that close and medium-spaced parallel runways can generate capacities approximately equal to those of an independent pair in good weather, when operated according to Visual Flight Rules (VFR), as they often are in the USA. Simulta- neous parallel runway operations, with some restrictions, can be conducted under VFR on runway pairs separated by as little as 700 ft (214 m) according to the FAA and the ICAO. However, the FAA recommends at least 1200 ft (366 m) of separation between centerlines when the runways are used by aircraft in Group V or higher. The space available between pairs of close or medium-spaced parallel runways is gen- erally insufficient for the development of a landside complex with high capacity. Thus, at airports with such runway systems, landside facilities are typically located at one or both sides of the runway pair. An important disadvantage in such cases is that aircraft operating on the runway farthest from the passenger building must cross the other (active) runway or its extension. This, in turn, may decrease runway capacity and increase taxi times and delays on the airport�s surface, as well as the workload of air traffic controllers. Independent parallel runways usually provide sufficient space between them to accom- modate the bulk of an airport�s landside facilities, especially when the spacing is 5000 ft (1525 m) or more, as is most often the case. The main landside facilities are then built along