American Airlines Group Inc. (NASDAQ:AAL) is trading higher on Monday. The stock is testing resistance as the historic government shutdown may be coming to an end, which could be a catalyst for a breakout.Breakouts tend to be followed by moves higher. This is why American Airlines is our Stock of the Day.Resistance in a market is a price level or a narrow range where there is a large amount of supply or shares for sale.If a stock is moving higher, it is out of equilibrium. There are more shares to buy than ...