This is also part of the difference, from Wikipedia
In 1996, during the Clinton Administration, the governments of the U.S. and Iran reached a settlement at the International Court of Justice, which included the statement "... the United States recognized the aerial incident of 3 July 1988 as a terrible human tragedy and expressed deep regret over the loss of lives caused by the incident ..."[15] As part of the settlement, even though the U.S. government did not admit legal liability or formally apologize to Iran, it agreed to pay US$61.8 million on an ex gratia basis in compensation to the families of the Iranian victims.[16]
This is also part of the difference, from Wikipedia
In 1996, during the Clinton Administration, the governments of the U.S. and Iran reached a settlement at the International Court of Justice, which included the statement "... the United States recognized the aerial incident of 3 July 1988 as a terrible human tragedy and expressed deep regret over the loss of lives caused by the incident ..."[15] As part of the settlement, even though the U.S. government did not admit legal liability or formally apologize to Iran, it agreed to pay US$61.8 million on an ex gratia basis in compensation to the families of the Iranian victims.[16]