Airlines, banks, stock exchanges and trading platforms suffered brief website outages early Thursday after a key piece of internet infrastructure failed, sparking the second major interruption of the past 10 days. The outages on Thursday including Southwest Airlines (LUV), United Airlines (UAL), Commonwealth Bank of Australia (CBAUF), Westpac Bank (WBK) and Australia and New Zealand Banking Group (ANEWF) (ANZ). The Hong Kong Stock Exchange website.