Even UK, the only level 1 partner did not get codes.
Today.. the situation stand different.
The geo-strategic importance of Turkey puts it in position that it shall re-negotiate the rules.
Whereas the rule in it self was unfair,, and it was because US was in position to dictate the rules.
Today, Turkey can invest in J-20 or invest in alternate propositions.
I think very good move by Turkey.
F-35 without source codes is totally under US dictation and for sure Turkey cannot use it against other US friendly states.
and even Pakistan