American International Group is increasing the speed of its jumbo mortgage-backed security issuance and receiving better treatment in terms of credit enhancement requirements. An affiliate of AIG is preparing to issue a $395.7 million deal, according to presale reports released this week by Fitch Ratings and Kroll Bond Rating Agency. The issuance follows deals in March, May and September. The average loan age in AIG securities is also declining. Mortgages in the pending MBS have seasoned for ...