using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var airports = new List<Airport>

        {

            new Airport

            {

                Location = "Stockholm",

                Routes = new List<Route>

                {

                    new Route

                    {

                        RouteID = 1,

                        Destination = "Copenhagen",

                        Date = DateTime.UtcNow

                    },

                    new Route

                    {

                        RouteID = 2,

                        Destination = "Oslo",

                        Date = DateTime.UtcNow

                    },

                }

            }

        };

        var timetable = new List<object>();

        var items = from airport in airports

                    from route in airport.Routes

                    select new

                    {

                        FlightID = route.RouteID,

                        DepartFrom = airport.Location,

                        Destination = route.Destination,

                        Date = route.Date

                    };

        timetable.AddRange(items);

        Console.WriteLine(timetable);

    }

}

​

public class Airport

{

    public string Location { get; set; }

    public List<Route> Routes { get; set; }

}

​

public class Route

{

    public int RouteID { get; set; }

    public string Destination { get; set; }

    public DateTime Date { get; set; }

}