The answer is always Yes.
Upgrade on a 747. Yes.
Upgrade on a 777. Yes.
Upgrade on a 767. Yes
Upgrade on a 757. Yes.
Upgrade on a 737. Yes.
Upgrade on a 320. Yes.
Upgrade on a 319. Yes.
Upgrade on a CR700. Yes.
Upgrade on a EM170. Yes.
I can't wait until they get rid of TED to MCO and I can fly in F to MCO.