calculate_shenzhen_airlines_miles

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Shenzhen Airlines PhoenixMiles mileage (in kilometres) and qualifying segments for Shenzhen Airlines flights. PhoenixMiles is the Air China group programme (calculate_air_china_miles covers Air China flights). Mileage = distance in km (the great-circle miles x 1.609344; PhoenixMiles uses the IATA distance) x booking-class % (25% to 300%), at least 800 km in Business (J, C, D, Z, R) and 500 in Premium Economy and Economy; where Shenzhen prints two rates (J, R, B, U), the first is a flight within Mainland China (both airports CN) and the second an international or regional flight. Classes I, X and N earn nothing. The 25/30/50% elite bonus is a note only, and the flight is not added to the progress (PhoenixMiles does not say whether qualifying kilometres equal the mileage earned). Cards need Silver 40,000, Gold 80,000 or Platinum 160,000 qualifying km, or 25 / 40 / 90 qualifying segments, in 12 months; qk and qs are the member's own totals so far, used only for the progress. Give segs: one entry per one-way flight, in order, with its great-circle miles (calculate_flight_distance gives them) and the ISO country codes of its two airports. Takes no price. Uses cwsi.net's calculator and the airline's published rules. Unofficial.