Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,170
This is a question for the United forum. United rules will determine which TK fare class can be upgraded.
*A does have better processes for handling upgrades than the other alliances, but certain situations may require very expensive Y fares only.