public IActionResult GetFlights([FromQuery] string relative_to)
{
DateTime relativeTo = DateTime.Parse(relative_to,
CultureInfo.InvariantCulture,
DateTimeStyles.AdjustToUniversal);
bool syncAll = Request != null?Request.Query.ContainsKey("sync_all") : false;
List <Flight> flights = _flightsManager.GetRelativeFlights(relativeTo, syncAll);
return(new OkObjectResult(JsonConvert.SerializeObject(flights, Formatting.Indented)));
}