I seriously had no idea about MSN of these two aircrafts until you mention... But anyway the lifetime of an aircraft is basically calculated by the age of its structure together with the pressure cycles. So even though ADG is younger, it may have higher number of fuselage pressure cycles, making it to expire earlier. And ADG's interior condition was a nightmare !
As far as I remember it's 28/270 for ALO
As far as I remember it's 28/270 for ALO

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