Secondary Surveillance Radar (SSR) Mode S Elementary Surveillance (ELS) implementation in Europe has been expanded to include a much great number of flights, taking the initiative into its second phase. The use of SSR ELS, initially applied only to flights operating on city pairs within Mode S airspace, will now include flights originating outside but then remaining within Mode S airspace. This increases the number of eligible flights from approximately 1,000 a day to nearer 4,000 ...

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