public AirportDbContext(DbContextOptions <AirportDbContext> options) : base(options)
        {
            Database.EnsureCreated();
            if (Flights.CountAsync().Result == 0)
            {
                var item = new Flight()
                {
                    AircraftType  = "Boeing 777 Jet",
                    FromLocation  = "København",
                    ToLocation    = "Amsterdam",
                    DepartureTime = DateTime.Now,
                    ArrivalTime   = DateTime.Now
                };
                Flights.Add(item);
                SaveChanges();

                item = new Flight()
                {
                    AircraftType  = "Boeing 747 Jet",
                    FromLocation  = "København",
                    ToLocation    = "Rom",
                    DepartureTime = DateTime.Now,
                    ArrivalTime   = DateTime.Now
                };
                Flights.Add(item);
                SaveChanges();

                item = new Flight()
                {
                    AircraftType  = "Boeing 777 Jet",
                    FromLocation  = "København",
                    ToLocation    = "Paris",
                    DepartureTime = DateTime.Now,
                    ArrivalTime   = DateTime.Now
                };
                Flights.Add(item);
                SaveChanges();

                item = new Flight()
                {
                    AircraftType  = "Boeing 777 Jet",
                    FromLocation  = "København",
                    ToLocation    = "Berlin",
                    DepartureTime = DateTime.Now,
                    ArrivalTime   = DateTime.Now
                };
                Flights.Add(item);
                SaveChanges();

                item = new Flight()
                {
                    AircraftType  = "Boeing 777 Jet",
                    FromLocation  = "København",
                    ToLocation    = "Madrid",
                    DepartureTime = DateTime.Now,
                    ArrivalTime   = DateTime.Now
                };
                Flights.Add(item);
                SaveChanges();
            }
        }