UPDATE 1-Lufthansa files for EU approval of AUA takeover

* Deadline for first phase of EU review is June 17

* Lufthansa offer to AUA shareholders expires Monday

* Takeover conditional on EU aid approval, 75 pct holding

(Adds details, background; previous dateline FRANKFURT)

FRANKFURT/BRUSSELS, May 8 (Reuters) - Lufthansa AG (LHAG.DE: Quote, Profile, Research) has filed for European Commission approval for its planned takeover of Austrian Airlines (AUA) (AUAV.VI: Quote, Profile, Research), a spokesman for the German flagship carrier said on Friday.

Commission spokesman Jonathan Todd confirmed the EU regulatory watchdog had received Lufthansa's notification, and the deadline for the first phase of the EU's review of the case was June 17.

The European Union's executive Commission had launched an investigation in February into the planned deal, saying it had concerns over the price and restructuring plan.

Lufthansa had agreed in December to buy the loss-making Austrian carrier, expecting the move to make it Europe's biggest airline. As part of the deal, it is taking over Austrian state holding company OeIAG's 42 percent stake in AUA.

The deal also involves the Austrian state assuming around 500 million euros ($670.4 million) of AUA debt.