I have flown in and out of PDX, MSP and IAH nine times since mid-December. The last two trips, iyt seems that the engines are now cut back a bit 70-75 minutes out. I also take the same flights and while the departure times are the same, the arrival times are a bit later. Could be from cutting speeds and/or seasonal changes in the jet stream.
One hopes the airline (NWA?) is adjusting its schedules accordingly. My last flight back home to SEA very distinctly cut engines 30 minutes out (and I had a captain as a seatmate, dead-heading back home to PDX).
I'll keep an eye out for such, though my short trip to SFO & back next week may not be a good indicator.