Turkey may back out of the F-35 project because it is being assessed a share of the rising costs, and because it is becoming clear that the US Pentagon will not be sharing ‘flight codes’ and critical software relating to the jets. This leads to the possibility that someone could block the use of the jets, outside of Turkey’s control.
According to IRDW.org, Turkey plans to buy about 100 of the jets. But without source codes and control of the software it would be possible for outside sources to control the jets. According to Turkish sources, Turkey is worried that the US, or one of its key allies like Israel, might be able to block use of Turkey’s own jets if there was disagreement about a mission that Turkey might have. The US would have the power over what planes are designated as enemies, and thus the US would have the power to shut down the plane if Turkey had a third party conflict with a country that was a friend of the US.
The source claims that the UK is considering withdrawing from the project for the same reason.
Total cost of the project to Turkey is said to be $16 Billion.