April 15 (Reuters) - Airbus AIR.PA expects to finalise an agreement to buy part of the assets of Spirit AeroSystems SPR.N by the end of the April and close the deal by mid-year, "ideally by June 30", Chief Financial Officer Thomas Toepfer told shareholders.

Airbus has been negotiating for around a year to take over work carried out by at least four plants as part of a rare carve-up of the struggling aerostructures company with rival U.S. planemaker Boeing BA.N.

(Reporting by Tim Hepher;Editing by Alison Williams)

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