You'll also find American Airlines Group (NASDAQ: AAL), Alaska Air Group (NYSE: ALK), and Southwest Airlines (NYSE: LUV) among that group with respective losses of 12.5%, 12.8%, and 13.6%. Meanwhile, mineral mining stocks tumbled 10% last month, mostly in response to China's new efforts to cool overheating metals prices. Gold prices suffered the biggest daily loss in months back on June 17 with selling boosted by comments from the Federal Reserve suggesting it's finally looking to curb inflation with higher interest rates.