static void Main(string[] args)
{
var flight1 = new Airbus321("AC159");
var flight2 = new Boeing737("WS203");
flight2.Acknowledges(flight1);
flight1.Acknowledges(flight2);
var flight3 = new Embraer190("AC602");
flight3.Acknowledges(flight1);
flight1.Acknowledges(flight3);
flight3.Acknowledges(flight2);
flight2.Acknowledges(flight3);
flight1.Climb(5000);
}
static void Main(string[] args)
{
var flight1 = new Airbus321();
var boing2 = new Boing2();
var stealth3 = new Stealth3();
}