Airplane

string[] menuItems = new string[]
{
    "Zabronirovat",
    "Exit"
};
int selectedIndex = 0;

while (true)
{
    Console.Clear();
    ShowMenu(menuItems);
    ConsoleKeyInfo keyInfo = Console.ReadKey();
    switch (keyInfo.Key)
    {
        case ConsoleKey.DownArrow:
            selectedIndex++;
            break;
        case ConsoleKey.UpArrow:
            selectedIndex--;    
            break;
                default:
            break;
    } 

}
string[,] seats = new string[10, 4];
for (int i = 0; i < seats.GetLength(0); i++)
{
    for (int j = 0; j < seats.GetLength(1); j++)
    {
        Console.Write(" x ");
    }
    Console.WriteLine();
}

void ShowMenu(string[] menuItems)
{
    Console.WriteLine("Menu:");    
    int a = 1;
    foreach (string item in menuItems)
    { 
        if (a - 1 == selectedIndex)
        {
            Console.ForegroundColor = ConsoleColor.Blue;
        }
        else
        {
            Console.ResetColor();
        }
        Console.Write(a + ". " + item);
        Console.ResetColor();
        a++;
        Console.WriteLine();
    }
}