You can enter the flight number and date in seatguru to get the aircraft model. It's not 100% accurate but helps. The other way is to check flightaware for that

You can enter the flight number and date in seatguru to get the aircraft model. It's not 100% accurate but helps. The other way is to check flightaware for that flight number. This doesn't protect you from an aircraft change and I don't know how I would deal with it if it happened.