An American Airlines Airbus A321-231 aircraft sits at the gate in Las Vegas in January. (Photo by ... More Artur Widak)NurPhoto via Getty ImagesAmerican Airlines provided negative current quarter guidance and unusually wide full-year guidance as it reported second quarter results. Its pre-tax margin was again below competitors’.Interviewed on CNBC Squawk Box, American CEO Robert Isom said that in the current quarter, “We see domestic travelers coming back into this.” He said July was a difficult month, part ...