Aircraft leasing giant International Lease Finance Corp has unveiled plans for an initial public offering, taking the first steps to spin off from parent company American International Group Inc. In a filing with the Securities and Exchange Commission late on Thursday, the Century City company, commonly known as ILFC, said: \"AIG has determined that ILFC is not one of its core businesses.\" The filing may mark the beginning of the end for AIG\'s 21-year ownership of ILFC. The subsidiary has struggled since AIG\'s near collapse in 2008 left the parent company under government control.