I have a reservation on DL for a translatlantic flight. The material Delta emailed me doesn't say what type of aircraft it is, and the itinerary on the Delta web site seat selection pagejust says it's a 767; I can't find out anything more specific on the Delta site. But when I go to seatguru.com to check out the seating and click on the list for Delta, it offers me charts for six types of 767:
Is there somewhere I can look up exactly what type of aircraft I'm flying? Or if I'm flying transatlantic, does that mean it's the last one?

And in that case, what about if I'm not flying transatlantic -- how can I tell then which 767 I'm flying?

Thanks for any advice.