Originally Posted by Mwenenzi

No. You will only be able to book on EY partners at the EY rates shown on the EY web site. Not on partners of partners. Or using AA rates
Generally awards are prime flight numbers (not code shares). A very few specific exception with some ffp's

Is EY ffp the best use of your thankyou points?
Citi TYP link---> Citi ThankYou Points (TYPs): airline transfer partners