public IEnumerable <PilotListItem> Get([FromQuery] int?userID)
 {
     if (userID == null)
     {
         return(_aviBL.GetPilots().Select(pilot => PilotListItem.FromDLModel(pilot)));
     }
     return(_aviBL.GetPilotsByProducerID((int)userID).Select(pilot => PilotListItem.FromDLModel(pilot)));
 }
 public IEnumerable <PilotListItem> Get()
 {
     return(_aviBL.GetPilots().Select(pilot => PilotListItem.FromDLModel(pilot)));
 }