private void InitCoupons()
{
Coupon coupon1 = new Coupon();
Coupon coupon2 = new Coupon();
Coupon coupon3 = new Coupon();
coupon1.Id = 1;
coupon1.Luggages = Luggages;
coupon1.Flight = Flights.Find(f => f.Id == 1);
coupon2.Id = 2;
coupon2.Flight = Flights.Find(f => f.Id == 2);
coupon2.Luggages.Add(Luggages.Find(l => l.Weight == 50));
coupon3.Id = 3;
Coupons.Add(coupon1);
Coupons.Add(coupon2);
Coupons.Add(coupon3);
Flights.Find(f => f.Id == 1).Coupons.Add(coupon1);
Flights.Find(f => f.Id == 2).Coupons.Add(coupon2);
}
