//reallocate all gates and facilities from one airport to another - gates, facilities and routes
        public static void ReallocateAirport(Airport oldAirport, Airport newAirport, Airline airline)
        {

            //contract
            List<AirportContract> oldContracts = oldAirport.getAirlineContracts(airline);

            foreach (AirportContract oldContract in oldContracts)
            {

                oldAirport.removeAirlineContract(oldContract);

                oldContract.Airport = newAirport;

                AirportHelpers.AddAirlineContract(oldContract);


                for (int i = 0; i < oldContract.NumberOfGates; i++)
                {
                    Gate newGate = newAirport.Terminals.getGates().Where(g => g.Airline == null).First();
                    newGate.Airline = airline;

                    Gate oldGate = oldAirport.Terminals.getGates().Where(g => g.Airline == airline).First();
                    oldGate.Airline = null;
                }


            }
            //routes
            var obsoleteRoutes = (from r in airline.Routes where r.Destination1 == oldAirport || r.Destination2 == oldAirport select r);

            foreach (Route route in obsoleteRoutes)
            {
                if (route.Destination1 == oldAirport) route.Destination1 = newAirport;
                if (route.Destination2 == oldAirport) route.Destination2 = newAirport;


                var entries = route.TimeTable.Entries.FindAll(e => e.Destination.Airport == oldAirport);

                foreach (RouteTimeTableEntry entry in entries)
                    entry.Destination.Airport = newAirport;

                foreach (FleetAirliner airliner in route.getAirliners())
                {
                    if (airliner.Homebase == oldAirport)
                        airliner.Homebase = newAirport;
                }
            }

            //facilities
            foreach (AirportFacility facility in oldAirport.getCurrentAirportFacilities(airline))
            {
                newAirport.addAirportFacility(airline, facility, GameObject.GetInstance().GameTime);
            }

            oldAirport.clearFacilities(airline);

            foreach (AirportFacility.FacilityType type in Enum.GetValues(typeof(AirportFacility.FacilityType)))
            {

                AirportFacility noneFacility = AirportFacilities.GetFacilities(type).Find((delegate(AirportFacility facility) { return facility.TypeLevel == 0; }));

                oldAirport.addAirportFacility(airline, noneFacility, GameObject.GetInstance().GameTime);
            }
        }
        //adds a subsidiary airline to an airline
        public static void AddSubsidiaryAirline(Airline airline, SubsidiaryAirline sAirline, double money, Airport airportHomeBase)
        {
            AddAirlineInvoice(airline, GameObject.GetInstance().GameTime, Invoice.InvoiceType.Airline_Expenses, -money);
            sAirline.Money = money;
            sAirline.StartMoney = money;

            sAirline.Fees = new AirlineFees();

            airline.addSubsidiaryAirline(sAirline);

            if (!AirportHelpers.HasFreeGates(airportHomeBase, sAirline) && airportHomeBase.Terminals.getFreeGates() > 1)
            {
                AirportHelpers.RentGates(airportHomeBase, sAirline, AirportContract.ContractType.Full, 2);
                //sets all the facilities at an airport to none for all airlines
                foreach (Airport airport in Airports.GetAllAirports())
                {

                    foreach (AirportFacility.FacilityType type in Enum.GetValues(typeof(AirportFacility.FacilityType)))
                    {
                        AirportFacility noneFacility = AirportFacilities.GetFacilities(type).Find((delegate(AirportFacility facility) { return facility.TypeLevel == 0; }));

                        airport.addAirportFacility(sAirline, noneFacility, GameObject.GetInstance().GameTime);
                    }

                }

                foreach (AirlinePolicy policy in airline.Policies)
                    sAirline.addAirlinePolicy(policy);

                AirportFacility serviceFacility = AirportFacilities.GetFacilities(AirportFacility.FacilityType.Service).Find(f => f.TypeLevel == 1);
                AirportFacility checkinFacility = AirportFacilities.GetFacilities(AirportFacility.FacilityType.CheckIn).Find(f => f.TypeLevel == 1);

                airportHomeBase.addAirportFacility(sAirline, serviceFacility, GameObject.GetInstance().GameTime);
                airportHomeBase.addAirportFacility(sAirline, checkinFacility, GameObject.GetInstance().GameTime);

            }

            Airlines.AddAirline(sAirline);

        }
        //sets up an airport for an airline
        private static void SetupScenarioAirport(Airline airline, Airport airport, int quantity = 2)
        {
            for (int i = 0; i < quantity; i++)
            {
                if (!AirportHelpers.HasFreeGates(airport,airline))
                    AirportHelpers.RentGates(airport, airline,AirportContract.ContractType.Full);
            }

            AirportFacility checkinFacility = AirportFacilities.GetFacilities(AirportFacility.FacilityType.CheckIn).Find(f => f.TypeLevel == 1);
            AirportFacility facility = AirportFacilities.GetFacilities(AirportFacility.FacilityType.Service).Find((delegate(AirportFacility f) { return f.TypeLevel == 1; }));

            airport.addAirportFacility(airline, facility, GameObject.GetInstance().GameTime);
            airport.addAirportFacility(airline, checkinFacility, GameObject.GetInstance().GameTime);
        }