If you have a free account on https://www.expertflyer.com/ https://www.expertflyer.com/ and attempt to create a seat alert (but don't go through with it) the Ai

If you have a free account on https://www.expertflyer.com/ https://www.expertflyer.com/ and attempt to create a seat alert (but don't go through with it) the Aircraft type will be displayed above the seat map once you type in the flight details. This will also work for aircraft swaps (including last-minute ones) all the way until the plane leaves.