Back in the 70's I was a F/O on a B727-100 Flying from Perth in Western Australia to Melbourne in Victoria.
At one stage over the great Australian bight we had +225kts tail wind at FL310 and a G/S of 750kts for about 30 minutes. We did wind the old girl up to M.89 just for while.
The dear old B727-100 could really get a move on if needed.
Lovely to fly as well.