Thanks mgcsinc for your response. Would you mind informing me where did you get the information for the a/c #3451 to know that it does not have E+ seating? Thanks
The folks who maintain the fleet page at
http://sites.google.com/site/unitedfleetsite/ do a great job — navigate to United Mainline Fleet ==>> Boeing 737-900 ===> and filter down to AIRCRAFT = 3451.
You can get the ship number for your flight from the united.com "flight status" page or from the mobile.united.com status page — both will say what aircraft number is assigned to operate your flight.