While ratings methodology has remained the same for aircraft-lease ABS, all three rating agencies have altered their underlying assumptions, panelists said at UBS' Opportunities in Structured Aircraft Debt conference. Assumptions that have been tweaked relate primarily to asset residual values and lease rates, while diversity and asset life are viewed as being still-viable assumptions for rating aircraft lease transactions.

All concurred that while demand has shifted greatly over the last two years and that "there are some older aircraft types that will never be in use again," the 25-year life expectancy for new narrow-body aircraft remains valid.

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