The last civilian Tu-104 flight occurred in 1981, of course for Aeroflot (7/2/1981 I think..or maybe that was the date of a Navy Tu-104)
As to the last flight, I don't know the particulars there, but I wouldn't be surprised if it was to Ryazan.
LZ-TLT...are you sure the Indian Air Force operated the Tu-104? Got info on those at all? Just knocked be back a bit with that.