The aircraft suffered an in-flight break up while being flown too fast for its design limits, say investigators.
Cardiff management, players and supporters have paid tribute to Emiliano Sala on the first anniversary of his death.
Sala was reportedly exposed to harmful levels of carbon monoxide before he was killed in a plane crash.
Nantes have lodged a complaint with FIFA over Cardiff's refusal to pay the first instalment of the £15m fee.
An investigation into the plane crash which killed Emiliano Sala will focus on the validity of the pilot's licence.
"There are a lot of questions which need to be answered and that is what we are trying to do."
Nantes have reportedly demanded payment from Cardiff for the £15million transfer of Emiliano Sala.
Nantes have reacted with anger at the decision to call off the search for Emiliano Sala's missing plane.
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