public void PurchaseTerminal(Airline airline)
{
Airline = airline;
double yearlyPayment = AirportHelpers.GetYearlyContractPayment(
Airport,
AirportContract.ContractType.Full,
Gates.NumberOfGates,
20);
AirportHelpers.AddAirlineContract(
new AirportContract(
Airline,
Airport,
AirportContract.ContractType.Full,
Type,
GameObject.GetInstance().GameTime,
Gates.NumberOfGates,
20,
yearlyPayment*0.60,
true));
}