TheAirline.Models.Airlines.Airline.RemoveAirport C# (CSharp) Method

        public void RemoveAirport(Airport airport)
        {
            Airports.Remove(airport);

            airport.Cooperations.RemoveAll(r => r.Airline == this);
        }

        public void SwitchAirline(Airline airlineFrom, Airline airlineTo)
        {
            List<AirportContract> contracts = Airport.GetAirlineContracts(airlineFrom);

            foreach (AirportContract contractFrom in contracts)
            {
                contractFrom.Airline = airlineTo;

                for (int i = 0; i < contractFrom.NumberOfGates; i++)
                {
                    Gate gate = contractFrom.Airport.Terminals.GetGates().First(g => g.Airline == airlineFrom);
                    gate.Airline = airlineTo;
                }
            }

            airlineFrom.RemoveAirport(Airport);

            if (!airlineTo.Airports.Contains(Airport))
            {
                airlineTo.AddAirport(Airport);
            }
        }