The EADS group includes Airbus, manufacturer of the A380
Preliminary charges have been filed against a former EADS executive for selling company shares before disclosing delays to the A380 plane.
Jean-Paul Gut will be investigated for insider trading, but will be freed on a bail payment of 400,000 euros ($620,297; £317,147).
When details of delays to the A380 project were announced in June 2006, shares in EADS slumped 26% in a day.
Mr Gut has been detained since Monday. His lawyers deny any wrongdoing.
Anne Meaux, a spokeswoman for Mr Gut, said the charges were "the logical continuation of the procedure".
His lawyers have defended their client's sale of shares as a lawful exercise of stock options.
The Paris prosecutor began inquiries in 2006 and the financial markets authority, AMF, is also investigating.
Mr Gut, a former deputy chief executive, left EADS last year.
The AMF investigation is focused on sales of shares by 17 current and former EADS executives and shareholders.