DotNetCoreServices DistanceService - calculates distance between 2 airports in miles Usage: request: /api/distance/KBP-AMS response: {"airportOne":"KBP","airportTwo":"AMS","distance":"1131 miles"} KBP, AMS - IATA codes (https://en.wikipedia.org/wiki/List_of_airports_by_IATA_code:_A)