JDiver

CHG = Indicated change of aircraft, also often a "Change of Gauge" here. A slick way of also depriving you of some miles, as if you had though you'd get DFW-MIA-EZE miles, you won't; you will only earn as if you were flying DFW-EZE.

AA used to have (AA38) a SFO-DFW share flight numbers with the DFW-ZRH flight - even though they were both 763s, one changed aircraft in DFW - but iles awarded were only as if there were a nonstop SFO-ZRH. At least there wasn't the insult of changing from a 777 to a Mad Dog or Trireme for ~four hours. (True mileage-gobbling FTers would probably book a different SFO-DFW flight to get full miles.)