Speaking of Air India, last Jan 2008 I was on one of the last 747 flights in business class to DEL, before replaced with the new 777s, JFK-LHR-DEL
The flight out I swear that was one of the original 747s. VERY tired interior, no individual entertainment system in business class. IT WAS ROUGH. There was duck tape on the steps up to the upper level...
I was scared, haha.
On the way back the 747 was newer and was in much better shape.... Nonetheless I think things have improved dramatically with the new 777s