Originally Posted by
beaver
If you use flightstats.com, you can look up the tail number of your flight a day or so in advance.
Anything that starts with N3xxAS is a non ER -900, tails that are N4xxAS are ER -900s.
Aircraft can be swapped as you get closer to flight time, but it is usually reflected on flightstats.com. It's a good resource.
Thanks. Looks like its an -800 tail # is N546AS -