I am a silver premier member of United. One good thing being a premier member of United is that I can enjoy Economy Plus seating.
I found a ticket issued by Continental, but operated by United. In this case, can I enjoy Economy Plus seating?
I fly Continental pretty frequently, and to my knowledge they don't have anything called "Economy Plus". They do, however, have "Extra legroom" seats (which I believe is essentially the same thing).
United's Elite benefits page states as one of the benefits:
With your United status, Continental.com says you can reserve an extra legroom seat during the check-in process (not when you book your ticket) - if those seats are available:
If you book your ticket after January 1, 2012, you (as a Premier Silver member) will not be able to choose Economy Plus when you book your ticket on the new United, but the option will be available to you at check-in. Beginning in January, you'll have to have Gold or higher status to choose economy plus for free when you book your ticket.