I asked because I booked a flight for March, EWR-SEA, roundtrip. They canceled our return flight on a newer 737-800 and now we are flying on version 1 roundtrip. I thought maybe they would be pulling a version 1 & replacing it with a version 2, but it was the opposite. Once they canceled the flight, they moved us to an earlier one. I hope that maybe they put the flight back in.