private void button6_Click(object sender, EventArgs e)
        {
            DataGridViewRow fila = dataGridView1.CurrentRow;
            int             idAvion;

            try
            {
                idAvion = Convert.ToInt32(fila.Cells[0].Value);
                formAsientos asientos = new formAsientos(idAvion);
                asientos.ShowDialog();
            }
            catch (Exception)
            {
            }
        }
        private void button6_Click(object sender, EventArgs e)
        {
            DataGridViewRow fila = dataGridView1.CurrentRow;
            int idAvion = Convert.ToInt32(fila.Cells[0].Value);

            formAsientos asientos = new formAsientos(idAvion);
            asientos.ShowDialog();
        }