The FAA on April 18, 2006 posted an NPRM in the Federal Register with a list of proposed Life Cycle for all airliners. You can find it by doing a Goggle search for "NPRM Airliner Life Cycles Federal Register April 18, 2006. The NPRM comment period was just extended for 90 days.
By the way a A-300 service goal is 48,000 cycles a 757 is 50,000 cycles and the 747 is 20,000 cycles. All these can be increased but it requires manfactures provide addition inspections and modifications that must be incorporated.
There is a web site that provides details on the work required to extend the A-300's life to 60,000 cycles it is:
www.galaxyscientific.com/agingaircraft/pdfs/5b/5b3d.pdf[/url]