//adds a new airliner class to the airliner
public void AddAirlinerClass(AirlinerClass airlinerClass)
{
if (airlinerClass != null)
{
if (Classes.Exists(c => c.Type == airlinerClass.Type))
{
Classes[Classes.FindIndex(c => c.Type == airlinerClass.Type)] = airlinerClass;
}
else
{
Classes.Add(airlinerClass);
if (airlinerClass.GetFacilities().Count == 0)
{
airlinerClass.CreateBasicFacilities(Airline);
}
}
}
}