public async override Task Insert <T>(T item)
{
if (typeof(T) == typeof(Aircraft))
{
var aircraft = CreateCopy(item as Aircraft);
InternalData.AddAircraft(aircraft);
}
if (typeof(T) == typeof(Airfield))
{
InternalData.AddAirfield(CreateCopy(item as Airfield));
}
if (typeof(T) == typeof(AcType))
{
InternalData.AddAcType(CreateCopy(item as AcType));
}
if (typeof(T) == typeof(Flight))
{
InternalData.AddFlight(CreateCopy(item as Flight));
}
}