A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,417
Assuming that you mean that the flight is operated by LH, not just a codeshare, and is LH booking class Z. Also, if you read the T&C about keeping your account active, the third year seems to just be a chance to correct possible missing credits from earlier, not a final chance to credit a flight and save your acccount, although the *Gold cards seem to be good for at least three years.