Potential buyers ofAir Berlinhave until 15 September to submit their offers, the carrier has confirmed.

"Air Berlinwill complete the investor process quickly," says the Oneworld member, which filed for insolvency earlier this month after shareholderEtihadsignalled it was ending financial support.

Since then a number of airlines have either expressed an interest in acquiring all or part ofAir Berlinor submitted a formal bid, includingLufthansa,Ryanair,Germania, TUI and German turnaround specialistIntro Group.EasyJethas also been linked with the process.

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Separately, a regional court in Berlin says it will convene on 15 September to hear a complaint fromGermaniathat a €150 million (USD 176 million) being provided toAir Berlinby the German government breaches European state-aid rules.

The court saysGermaniahas called for the loan to be frozen until the European Commission gives its consent.