private void planesModels_comboBox_SelectedIndexChanged(object sender, EventArgs e)
{
newCapacityValue_textBox.Text = FormDatabaseHelper.getPlaneCapacity(planesModels_comboBox.SelectedItem.ToString()).ToString();
//FormDatabaseHelper.updateCapacityBox(planesModels_comboBox.SelectedItem.ToString() , newCapacityValue_label);
}