Удаление элемента списка/вывод нового списка - C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections;

namespace ConsoleApplication19
{
    class Program
    {
        enum FlightType
        {
            flights,
        }
 
        struct AirplanesProperties
        {
            public int number;
            public string city;
            public string airline;
            public int terminal;
            public int arrivalTime;
            public int shippingFlight;
            public int bgate;
 
            static void Main(string[] args)
            {
                long a;
                Console.WriteLine(@"Please,  type the number:
            1. arrivalTime1
            2. udalenie elementa massiva
            3. Poisk po aviakompanii
            ");
 
                a = long.Parse(Console.ReadLine());
                switch (a)
                {
                    case 1:
                        Arrivaltime1();
                        Console.WriteLine("");
                        break;

                    case 2:
 
                        ShippingFlight();
                        Console.WriteLine("");
                        break;
 
                    case 3:
 
                        gate();
                        Console.WriteLine("");
                        break;
                    default:
                        Console.WriteLine("Exit");
                        break;
 
                }
                Console.WriteLine("Press any key");
                Console.ReadLine();
            }

            #region ArrivalTime1        
            private static void Arrivaltime1()
            {
                int x;
                int y;
                int z;
                int k;
 
                Console.WriteLine("arrivalTime1");
                x = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("arrivalTime2");
                y = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("arrivalTime3");
                z = Convert.ToInt32(Console.ReadLine());
                Console.WriteLine("arrivalTime4");
                k = Convert.ToInt32(Console.ReadLine());
 
                AirplanesProperties[] fligths = new AirplanesProperties[4];
                fligths[0] = new AirplanesProperties { number = 1, arrivalTime = x, };
                fligths[1] = new AirplanesProperties { number = 2, arrivalTime = y, };
                fligths[2] = new AirplanesProperties { number = 3, arrivalTime = z, };
                fligths[3] = new AirplanesProperties { number = 4, arrivalTime = k, };
 
                Array.Sort(fligths);
 
                System.Console.WriteLine(fligths);

            }
            #endregion
            // udalenie elementa massiva
            #region shippingFlight
            private static void ShippingFlight()
            {
                List<AirplanesProperties> fligth = new List<AirplanesProperties>();
                fligth.Add(new AirplanesProperties { number = 1, city = "kiyev", airline = "PAU", terminal = 1, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "kiyev", airline = "PAU", terminal = 1, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "MAU", terminal = 3, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "MAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "RAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "RAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });              
                // int n;
                //n=Convert.ToInt32(Console.ReadLine());
 
                //по индексу
                 fligth = fligth.Where((number, n) => n != 0).ToArray();
                //вообще всё не нравится

                //удаление по значению
                fligth = fligth.Where(n => !n.Equals.fligth.ElementAt(del).ToArray());
                Console.WriteLine(string.Join(" ", fligth.Select(x => x.ToString()).ToArray()));
               
                //проблема в Equals 
 
                //или так,
                fligth = fligth.Where(n => fligth.ElementAt(del) != n).ToArray();
                //матюкается на !=
            }
            #endregion
            //Poisk po aviakompanii
            #region gate
            private static void gate()
            {
                string z;
                Console.WriteLine("set the airline to found");
                z = Convert.ToString(Console.ReadLine());
                List<AirplanesProperties> fligth = new List<AirplanesProperties>();
                fligth.Add(new AirplanesProperties { number = 1, city = "kiyev", airline = "PAU", terminal = 1, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "kiyev", airline = "PAU", terminal = 1, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "MAU", terminal = 3, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "MAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "RAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                fligth.Add(new AirplanesProperties { number = 1, city = "Odessa", airline = "RAU", terminal = 5, arrivalTime = 0, shippingFlight = 0, bgate = 1 });
                List<AirplanesProperties> result = fligth.Where(x => x.airline == z).ToList(); 
                Console.WriteLine(fligth);
            }
            #endregion
        }
    }
}